Synonym word of in-efficacy:

bitter pill, blind alley, blow, blunder, bringdown, bummer, bust, calamity, defeat, disaster, discouragement, downer, downfall, drag, dud, error, failure, false alarm, faux pas, fiasco, fizzle, flash in the pan, impasse, inefficacy, lemon, miscalculation, mischance, m


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Synonyms:  A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Popular