noun
blemish, imperfection
Synonyms: birthmark, blot, blotch, break, bug, catch, check, crack, deficiency, deformity, discoloration, drawback, error, failing, fault, flaw, foible, frailty, gap, glitch, gremlin, hole, infirmity, injury, irregularity, kink, knot, lack, mark, marring, mistake, patch, rift, rough spot, scar, scarcity, scratch, seam, second, shortage, shortcoming, sin, speck, spot, stain, taint, unsoundness, vice, want, weakness, weak point
Antonyms: advantage, improvement, perfection, strength
verb
break from belief, faith
Synonyms: abandon, abscond, apostatize, back out, break faith, change sides, depart, desert, fall away from, forsake, go, go back on, go over, go over the fence, lapse, leave, pull out, quit, rat, rebel, reject, renege, renounce, revolt, run out, schism, sell out, spurn, take a walk, tergiversate, tergiverse, turn, turn coat, walk out on, withdraw
Antonyms: come in, join