Something smooth is free of roughness, stubble, or other imperfections that you can feel with your hands. If your wooden table is giving you splinters, use a sander to smooth it down and make it smooth. As you can see, smooth works as both a verb and an adjective.

Smooth has lots of interesting uses: Caught in a wind storm? Better smooth out your hair when you head inside. Got a friend who's good with the ladies? Try imitating his smooth moves. Need help to smooth out a dispute between two friends? Invite them out for coffee and offer to help them smooth out their differences. Some pianists prefer ivory keys to plastic because they're less smooth, and their fingers don't slip. The best dancers can move smoothly from one move to another.

Definitions of smooth
  1. adjective
    having a surface free from roughness or bumps or ridges or irregularities
    smooth skin”
    “a smooth tabletop”
    smooth fabric”
    “a smooth road”
    “water as smooth as a mirror”
    being level or straight or regular and without variation as e.g. in shape or texture; or being in the same plane or at the same height as something else (i.e. even with)
    (of linens or clothes) smoothed with a hot iron
    of textures that are smooth to the touch or substances consisting of relatively small particles
    slippery, slippy
    causing or tending to cause things to slip or slide
    creaseless, uncreased
    used especially of fabrics
    having an even texture
    (of surfaces) conducive to rapid speeds
    fine-textured, smooth-textured
    having a smooth, fine-grained structure
    resembling glass in smoothness and shininess and slickness
    seamless, unlined, unseamed
    smooth, especially of skin
    aerodynamic, flowing, sleek, streamlined
    designed or arranged to offer the least resistant to fluid flow
    velvet, velvet-textured, velvety
    smooth and soft to sight or hearing or touch or taste
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    rough, unsmooth
    having or caused by an irregular surface
    not even or uniform as e.g. in shape or texture
    unironed, wrinkled
    (of linens or clothes) not ironed
    not carefully reworked or perfected or made smooth by polishing
    contrary to rule or accepted order or general practice
    coarse, harsh
    of textures that are rough to the touch or substances consisting of relatively large particles
    not slippery; not likely to slip or skid
    abrasive, scratchy
    causing abrasion
    alligatored, cracked
    of paint or varnish; having the appearance of alligator hide
    resembling the rough bark of a tree
    broken, rugged
    topographically very uneven
    of leaves; appearing puckered as if blistered
    covered with or full of bumps
    chapped, cracked, roughened
    used of skin roughened as a result of cold or exposure
    corded, twilled
    of textiles; having parallel raised lines
    costate, ribbed
    (of the surface) having a rough, riblike texture
    cragged, craggy, hilly, mountainous
    having hills and crags
    treated so as to have a permanently wrinkled appearance
    homespun, nubbly, nubby, slubbed, tweedy
    of textiles; having a rough surface
    imbricate, imbricated
    used especially of leaves or bracts; overlapping or layered as scales or shingles
    lepidote, leprose, scabrous, scaly, scurfy
    rough to the touch; covered with scales or scurf
    covered with tiny scales
    lined, seamed
    (used especially of skin) marked by lines or seams
    pocked, pockmarked, potholed
    used of paved surfaces having holes or pits
    rock-ribbed, rockbound
    abounding in or bordered by rocky cliffs or scarps
    bouldered, bouldery, rocky, stony
    abounding in rocks or stones
    gravelly, pebbly, shingly
    abounding in small stones
    somewhat rough
    of leaves; ridged or wrinkled
    having the abrasive texture of sandpaper
    having rough edges that can be used for sawing
    covered with scabs
    shagged, shaggy
    having a very rough nap or covered with hanging shags
    coarse-textured, rough-textured, textured
    having surface roughness
    verrucose, wartlike, warty
    (of skin) covered with warts or projections that resemble warts
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  2. adjective
    of motion that runs or flows or proceeds without jolts or turbulence
    “a smooth ride”
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    bumpy, jolting, jolty, jumpy, rocky, rough
    causing or characterized by jolts and irregular movements
  3. adjective
    smooth and unconstrained in movement
    “a long, smooth stride”
    synonyms: fluent, fluid, liquid
    characterized by beauty of movement, style, form, or execution
  4. adjective
    (of a body of water) free from disturbance by heavy waves
    “a smooth channel crossing”
    synonyms: placid, quiet, still, tranquil, unruffled
    (of weather) free from storm or wind
  5. adjective
    of the margin of a leaf shape; not broken up into teeth
    simple, unsubdivided
    (botany) of leaf shapes; of leaves having no divisions or subdivisions
    composed of more than one part
    (of leaves or petals) having a smooth edge; not broken up into teeth or lobes
    having a slightly undulating margin
    having a strongly waved margin alternately concave and convex
    having a wavy margin and rippled surface
    unnotched, untoothed
    having no notches
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    of the margin of a leaf shape; having the edge cut or fringed or scalloped
    simple, unsubdivided
    (botany) of leaf shapes; of leaves having no divisions or subdivisions
    composed of more than one part
    having toothlike projections that are themselves toothed
    having saw-like notches with the notches themselves similarly notched
    ciliate, ciliated
    having a margin or fringe of hairlike projections
    crenate, crenated, scalloped
    having a margin with rounded scallops
    crenulate, crenulated
    having a margin with small rounded teeth
    wavy or notched and curled very irregularly
    having toothlike projections in the margin
    having a very finely toothed margin
    having a notched tip
    erose, jagged, jaggy, notched, toothed
    having an irregularly notched or toothed margin as though gnawed
    having a fringe of slender processes
    fringed, laciniate
    having edges irregularly and finely slashed
    lacerate, lacerated
    irregularly slashed and jagged as if torn
    like a comb
    having a surface covered with a network of cracks and small crevices
    having incised margins with the lobes or teeth pointing toward the base; as dandelion leaves
    notched, saw-toothed, serrate, serrated, toothed
    notched like a saw with teeth pointing toward the apex
    minutely serrated
    having spines
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  6. adjective
    (music) without breaks between notes; smooth and connected
    synonyms: legato
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    disconnected, staccato
    (music) marked by or composed of disconnected parts or sounds; cut short crisply
    abrupt, disconnected
    marked by sudden changes in subject and sharp transitions
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  7. verb
    make smooth or smoother, as if by rubbing
    smooth the surface of the wood”
    synonyms: smoothen
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    make rough or rougher
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    remove the thread (of screws)
    smoothen the surface of
    level or smooth with a rake
    make even or smooth, with or as with a carpenter's plane
    make the surface of level or smooth
    sand, sandpaper
    rub with sandpaper
    grind with a sandblast
    smooth with a file
    sand roughly
    type of:
    change surface
    undergo or cause to undergo a change in the surface
  8. verb
    make (a surface) shine
    synonyms: polish, shine, smoothen
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    show 4 types...
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    Simonise, Simonize
    polish with wax
    sleek, slick
    make slick or smooth
    buff, burnish, furbish
    polish and make shiny
    give a shine or gloss to, usually by rubbing
    type of:
    beautify, embellish, fancify, prettify
    make more beautiful
  9. noun
    the act of smoothing
    “he gave his hair a quick smooth
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    type of:
    accomplishment, achievement
    the action of accomplishing something
  10. adjective
    lacking obstructions or difficulties
    “the bill's path through the legislature was smooth and orderly”
    posing no difficulty; requiring little effort
  11. adjective
    smoothly agreeable and courteous with a degree of sophistication
    “the manager pacified the customer with a smooth apology for the error”
    synonyms: bland, politic, suave
    diplomatic, diplomatical
    using or marked by tact in dealing with sensitive matters or people
  12. verb
    free from obstructions
    smooth the way towards peace negotiations”
    synonyms: smooth out
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    type of:
    disembarrass, free, rid
    relieve from
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