coarse

Coarse can mean rough to the touch or vulgar. It's good to have coarse sand paper, but not good to have coarse manners.

Do you lick your dinner plate, wipe your nose on your sleeve, and generally behave like an oaf? No, of course not. You're the kind of person who reads online dictionaries. But if you did do any of things, you'd be coarse — that is, unrefined, boorish, and downright vulgar. Coarse can apply to a wide variety of things other than behavior. If something is of poor quality, cheap and inferior, it's considered coarse.

Definitions of coarse
1

adj of textures that are rough to the touch or substances consisting of relatively large particles

coarse meal”
coarse sand”
“a coarse weave”
Synonyms:
harsh
coarse-grained, large-grained
not having a fine texture
coarse-grained, farinaceous, grainy, granular, granulose, gritty, mealy
composed of or covered with particles resembling meal in texture or consistency
granulated
made grainy or formed into granules
plush-like, plushy
(of textures) resembling plush
loose, open
(of textures) full of small openings or gaps
rough, unsmooth
having or caused by an irregular surface
Antonyms:
fine
of textures that are smooth to the touch or substances consisting of relatively small particles
close, tight
of textiles
close-grained, fine-grained
dense or compact in structure or texture, as a wood composed of small-diameter cells
dustlike
as fine and powdery as dust
floury
resembling flour in fine powdery texture
nongranular
not having granules
fine-grained, powdered, powdery, pulverised, pulverized, small-grained
consisting of fine particles
small
have fine or very small constituent particles
superfine
of extremely fine size or texture
smooth
having a surface free from roughness or bumps or ridges or irregularities
show more antonyms...

adj lacking refinement or cultivation or taste

“he had coarse manners but a first-rate mind”
Synonyms:
common, rough-cut, uncouth, vulgar
unrefined
(used of persons and their behavior) not refined; uncouth

adj of low or inferior quality or value

“"of what coarse metal ye are molded"- Shakespeare”
Synonyms:
common
inferior
of low or inferior quality

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