Synonyms of defective

1 Syllable

bad, wrong, poor, sans, sick

2 Syllables

sicker, numbskull, amok, flimsier, parter, kerflooey, lacking, crippled, wronging, wronger, fluffed, wrongest, badder, sketchy, punker, sickest, broken, flimsy, laid-up, flawed, wanting, gorked, faultier, unsound, sketchier, baddest, cruddy, junky, way-off, amiss, faulty, half-done, dumdum, seconds

3 Syllables

damaged, unbacked, impaired, abnormal, haywire, jerrybuilt, unhealthy, jerry-built, half-witted, erroneous, housebound, slivered, blemished, imperfect, retardo, injured, deficient, subnormal, retarded

4 Syllables

incomplete, unfinished, malfunctional, jerry-rigged, misfigured, dysfunctional, execrable, imprecise, unlikable, insufficient, unfulfilled, unassembled

5 Syllables

maladaptive, bottom-of-barrel, unretentive, hospitalized, underachieving, undesirable, inaccurate, inadequate, unaccomplished, unexecuted, unconsummated

6 Syllables

inoperative