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Definition of defect : 1. Failing; fault; imperfection, whether physical or moral; blemish; as, a defect in the ear or eye; a defect in timber or iron; a defect of memory or judgment.
2. To fail; to become deficient.
3. To injure; to damage.
4. Want or absence of something necessary for completeness or perfection; deficiency; - opposed to superfluity.

Synonyms:

agitate, boycott, underage, scarceness, approach, patch, reproach, foible, dishonor, foment, blight, vice, smirch, blacklist, disgrace, turn, shortfall, excrescency, excrescence, twist, tergiversate, trust, unsoundness, poverty, apostatize, demonstrate, shift, scantiness, weakness, blind spot, chase, frailty, gap, change sides, dislodge, scarcity, weak point, bug, better, break, excess, bring down, paucity, injury, help, lack, daub, Achilles' heel, deficit, failing, demerit, knot, dent, infirmity, blur, beautiful, seam, insufficiency, soil, desolate, blindness, shortage, faulting, shortcoming, scantness, sin, rat, renegade, geological fault, destabilize

abrade, stigma, scar, hack, eyesore, wart, fleck, blister, sore, weal, brand, pockmark, chip, spot, scuff, scratch, mark, dot, crack, abrasion, freckle, scab, scrape, splotch, defacement, hurt, deformity, deface, spoil, notch, rift, mar, kink, spoilage, blot, slit, impurity, distort, deform, speck, stain, blotch, discoloration, score, check, imperfection, taint, disfigure, discolor, hole, lesion, nick, gash, drawback, fracture, tarnish, damage, blemish, disfigurement

fault, misconception, misestimation, distortion, inaccuracy, typo, misprint, error, blunder, misconstruction, slip, fallacy, flaw, aberration, falsehood, mistake, misjudgment, oversight, miscalculation, gaffe

abdicate, surrender, drop, quit, evacuate, forsake, vacate, relinquish, leave, resign, abandon, desert, discontinue

faultiness, deficiency, incompleteness, inadequacy

betray, cross, backslide, abnegate, deny, retract, disavow

forgo, renounce, capitulate, withdraw, release, disown, disclaim, waive, give up, shed

Usage examples:

• This defect has run through all the editions; it is in the casting of the work. - "A Budget of Paradoxes, Volume II (of II)", Augustus de Morgan.
• He has the defect of his quality. - "My Contemporaries In Fiction", David Christie Murray.
• Is there a defect in the Russian character? - "Face to Face with Kaiserism", James W. Gerard.