Synonyms of defective in English:

defective


See definition of defective

adjective

1‘a defective seat belt’

SYNONYMS
faulty, flawed, imperfect, shoddy, inoperative, not working, not functioning, non-functioning, malfunctioning, out of order, unsound
weak, deficient, incomplete
in disrepair, broken, cracked, torn, scratched, deformed, warped, buckled
informal gone wrong, on the blink
British informal knackered, duff
ANTONYMS

working, perfect

2‘these methods are defective in strength and durability’

SYNONYMS
lacking, wanting, deficient, inadequate, insufficient, short, low, scant