A flaw in something is a defect. At certain stores you can buy clothes with slight defects. You have to be careful because the defect can be minor, like a missing button, or major, like sleeves of uneven lengths.

In a person, a defect is an imperfection, which can manifest itself mentally or physically. If you are diagnosed with a heart defect, you will have to seek the advice of specialists. A hearing defect might leave your dad deaf in one ear. If you are becoming forgetful, you can joke that you are developing a mental defect, but if it continues, you'll probably want to have your head examined.

Definitions of defect
  1. noun
    a failing or deficiency
    “that interpretation is an unfortunate defect of our lack of information”
    synonyms: shortcoming
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    type of:
    the quality of having an inferior or less favorable position
  2. noun
    a mark or flaw that spoils the appearance of something (especially on a person's body)
    synonyms: blemish, mar
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    birthmark, nevus
    a blemish on the skin that is formed before birth
    chatter mark
    a mark made by a chattering tool on the surface of a workpiece
    check, chip
    a mark left after a small piece has been chopped or broken off of something
    a blemish resulting from a break without complete separation of the parts
    dent, ding, divot, gouge, nick
    an impression in a surface (as made by a blow)
    a small congenital pigmented spot on the skin
    mark, scar, scrape, scratch
    an indication of damage
    burn, burn mark
    a place or area that has been burned (especially on a person's body)
    blot, daub, slur, smear, smirch, smudge, spot
    a blemish made by dirt
    a skin lesion that is a diagnostic sign of some disease
    verruca, wart
    (pathology) a firm abnormal elevated blemish on the skin; caused by a virus
    milium, whitehead
    a small whitish lump in the skin due to a clogged sebaceous gland
    blackhead, comedo
    a black-tipped plug clogging a pore of the skin
    a fine crack in a glaze or other surface
    a small gouge (as in the cover of a book)
    cigarette burn
    a burn mark left by a smoldering cigarette
    blotch, splodge, splotch
    an irregularly shaped spot
    fingermark, fingerprint
    a smudge made by a (dirty) finger
    a blot made with ink
    nevus flammeus, port-wine stain
    a flat birthmark varying from pink to purple
    hemangioma simplex, strawberry, strawberry mark
    a soft red birthmark
    common wart
    a benign growth (often with a rough surface)
    condyloma acuminatum, genital wart, venereal wart, verruca acuminata
    a small benign wart on or around the genitals and anus
    juvenile wart
    a small benign growth on the faces of hands of children
    plantar wart
    a wart occurring on the sole of the foot
    type of:
    appearance, visual aspect
    outward or visible aspect of a person or thing
  3. noun
    an imperfection in a bodily system
    “visual defects
    “this device permits detection of defects in the lungs”
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    any developmental defect of the spinal cord
    birth defect, congenital abnormality, congenital anomaly, congenital defect, congenital disorder
    a defect that is present at birth
    a congenital absence of eyelids (partial or complete)
    the congenital absence of pigmentation in the eyes and skin and hair
    anencephalia, anencephaly
    a defect in brain development resulting in small or missing brain hemispheres
    congenital absence of the uterus
    color blindness, color vision deficiency, colour blindness, colour vision deficiency
    genetic inability to distinguish differences in hue
    a congenital abnormality in males in which the urethra is on the upper surface of the penis
    clinocephalism, clinocephaly
    a congenital defect in which the top of the head is depressed (concave instead of convex)
    a congenital defect in which one or more toes or fingers are abnormally positioned
    a congenital disorder characterized by an abnormally large tongue; often seen in cases of Down's syndrome
    Down syndrome, Down's syndrome, mongolianism, mongolism, trisomy 21
    a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation
    acrocephaly, oxycephaly
    a congenital abnormality of the skull; the top of the skull assumes a cone shape
    cheiloschisis, cleft lip, harelip
    a congenital cleft in the middle of the upper lip
    cleft palate
    a congenital fissure of the hard palate
    congenital absence of an arm or leg
    congenital absence of part of an arm or leg
    protrusion of brain tissue through a congenital fissure in the skull
    a congenital anomaly of the central nervous system in which a sac protruding from the brain or the spinal meninges contains cerebrospinal fluid (but no nerve tissue)
    a congenital defect of the central nervous system in which a sac containing part of the spinal cord and its meninges protrude through a gap in the vertebral column; frequently accompanied by hydrocephalus and mental retardation
    congenital malformation of the skull in which the main axis of the skull is oblique
    congenital defect of having one or more extra chromosomes in somatic cells
    hermaphrodism, hermaphroditism
    congenital condition in which external genitalia and internal sex organs have both male and female characteristics
    congenital condition in which a person has external genitalia of one sex and internal sex organs of the other sex
    congenital malformation of the skull which is long and narrow; frequently accompanied by mental retardation
    congenital heart defect
    a birth defect involving the heart
    rachischisis, schistorrhachis, spina bifida
    a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis
    spinocerebellar disorder
    any of several congenital disorders marked by degeneration of the cerebellum and spinal cord resulting in spasticity and ataxia
    hyperdactyly, polydactyly
    birth defect characterized by the presence of more than the normal number of fingers or toes
    syndactylism, syndactyly
    birth defect in which there is partial or total webbing connecting two or more fingers or toes
    ankyloglossia, tongue tie
    a congenital anomaly in which the mucous membrane under the tongue is too short limiting the mobility of the tongue
    type of:
    imperfection, imperfectness
    the state or an instance of being imperfect
  4. noun
    an imperfection in an object or machine
    “if there are any defects you should send it back to the manufacturer”
    synonyms: fault, flaw
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    a flaw on a surface resulting when an applied substance does not adhere (as an air bubble in a coat of paint)
    bug, glitch
    a fault or defect in a computer program, system, or machine
    a fault
    type of:
    imperfection, imperfectness
    the state or an instance of being imperfect
  5. verb
    desert (a cause, a country or an army), often in order to join the opposing cause, country, or army
    synonyms: desert
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    desert one's party or group of friends, for example, for one's personal advantage
    type of:
    flee, fly, take flight
    run away quickly
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