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Definition of defective : 1. Anything that is defective or lacking in some respect.
2. Lacking some of the usual forms of declension or conjugation; as, a defective noun or verb.
3. One who is lacking physically or mentally.
4. Wanting in something; incomplete; lacking a part; deficient; imperfect; faulty; - applied either to natural or moral qualities; as, a defective limb; defective timber; a defective copy or account; a defective character; defective rules.

Synonyms:

speculative, risky, better, malfunctioning, abnormal, forged, tough, big, sorry, spoilt, lacking, unfit, uncollectible, high-risk, wanting, nonfunctional, excess, regretful

flecked, blotched, disfigured, fractured, distorted, splotched, scuffed, blistered, stained, specked, flawed, tainted, spoiled, scraped, impure, chipped, pockmarked, spotted, tarnished, abraded, damaged, marked, freckled, scored, scabbed, gashed, imperfect, cracked, nicked, deformed, defaced, marred, slit, scratched, notched, blemished, hacked, scarred, discolored

erroneous, misjudged, illogical, misconceived, inaccurate, incorrect, mistaken, misconstrued, miscalculated, misestimated, botched, fallacious, false

inadvisable, wrong, unfavorable, invalid, unsound, displeasing, arrant, irremediable, faulty, bad, poor, black, ill-suited, baneful, unsatisfactory, vile, wretched, detrimental, unpleasant, inferior, inadequate

deficient, second-rate, unfinished, incomplete, broken

idiotic, cretinous, stupid, imbecilic, moronic, unintellectual, foolish, half-wit, unintelligent

obscene, immoral, slovenly, sordid, unclean, dirty

Usage examples:

• Napoleon was enabled to discover with some ease the great numbers which had concentrated to oppose him from the fact that these numbers had concentrated upon a defective position. - "Waterloo", Hilaire Belloc.
• Its frequent use indicates defective asylum organization or management. - "Chapters in the History of the Insane in the British Isles", Daniel Hack Tuke.
• The order which dictated it gave an opening to misunderstanding; and, as is almost invariably the case when orders are defective, misunderstanding occurred. - "Stonewall Jackson And The American Civil War", G. F. R. Henderson.