deficient

Synonyms: amiss bad damaged defective exiguous faulty flawed found wanting impaired incomplete inferior infrequent injured insufficient lacking marred meager not cut out for not enough not make it not up to scratch outta gas rare scant scanty scarce second fiddle second string short shy sketchy skimpy third string unassembled unequal unfinished unsatisfactory wanting weak

Antonyms: adequate ample enough excessive faultless flawless perfect satisfactory sufficient superfluous