Reverse Dictionary: INEFFECTIVE

ADJECTIVES
► DRIPPY weak; ineffective; undesirable → 2006 US sl. (Bk.)
► EFFETE incapable of efficient action; ineffective → 1790
► FECKLESS of things: ineffective, feeble, futile, valueless, worthless → 1599 orig. Sc. & N. Eng. dial.
► INEFFICACIOUS ineffective → M17
► INFICIENT ineffective, of no effect → 1609 obs.
► PARALYTIC deprived or destitute of energy or power of action; powerless, ineffective; characterized by impotency, or powerlessness → 1642
► SISYPHEAN of or pert. to Sisyphus (a king of Corinth, whose punishment in Hades was to roll a heavy stone up a hill; as he reached the top, the stone rolled down again); resembling the fruitless toil of Sisyphus; endless and ineffective → 1635
► SISYPHIAN resembling the fruitless toil of Sisyphus; endless and ineffective → 1599
► SNAKE-BIT helplessly incapacitated; ineffective → 1940s Amer. sl.
► SNAKE-BITTEN helplessly incapacitated; ineffective → 1940s Amer. sl.
► WAFF of persons: feeble in body or mind, weak, exhausted, spiritless, stupid, ineffective → 1822 Sc.
► WAFF-LIKE of persons: feeble in body or mind, weak, exhausted, spiritless, stupid, ineffective → 1822 Sc.
► WANDOUGHT feeble, ineffective, worthless → 1788 Sc.
► WONKY badly done or made; ineffective; weird → 1923 Amer. sl.

ADVERBS
► SINGLY slightly, poorly, ineffectively → 1548 obs.

INTERJECTIONS
► I MIGHT AS WELL PLOUGH WITH DOGS! this is useless, or very ineffective! → 17C

NOUNS
► FART IN A THUNDERSTORM, A something of negligible worth or impact; something insignificant, ineffective, or fleeting → 1989 UK sl.

NOUNS – PERSON
► BASKET CASE an ineffective or powerless person → 1948
► BURNOUT someone no longer effective on the job → 1990 Amer. sl. (Bk.)
► DICKWARD ► DICKWEED a stupid and ineffective male → 2006 US sl. (Bk.)
► HELMET an ineffective and oafish male → 2006 US sl. (Bk.)
► JACKASS a stupid or foolish person; an ineffective and incompetent person; a dolt or an oaf; a blockhead → 1823 
► LAME DUCK a lame or incapacitated person, or one who is old, weak, or ineffective; an invalid; hence, someone or something of no use or value; an inefficient person → 1814 sl.
► TOOTIE FRUITIE a weak and ineffective male → 1970s US sl.
► WEAK SISTER a weak, ineffective person → 1857 US sl.

VERBS
► FREEZE ► FREEZE UP to become immobile and ineffective from fear → 1970s Amer. sl.
► JACK AROUND to mess about; to waste time; to act childishly; to be ineffective → 1960s sl.
► MUZZLE to render ineffective or inoperative → 1706 obs.
► NEGATIVE to render ineffective, to neutralize → 1837
► POKE to potter about; to move or work in a desultory, ineffective, or dawdling way; to be slow → 1811
► TAKE THE PIPE to become ineffective under pressure → 1970s US sl.