Synonyms of formidable in English:

formidable


See definition of formidable

adjective

1‘every man wore a formidable curved dagger’

SYNONYMS

intimidating, forbidding, redoubtable, daunting, alarming, frightening, terrifying, petrifying, horrifying, chilling, disturbing, disquieting, dreadful, brooding, awesome, fearsome, ominous, foreboding, sinister, menacing, mean-looking, threatening, dangerous

informal spooky, scary, creepy

archaic direful, bodeful

ANTONYMS

pleasant-looking, comforting

2‘they face a formidable task’

SYNONYMS

onerous, arduous, taxing, difficult, hard, heavy, laborious, burdensome, strenuous, vigorous, back-breaking, stiff, uphill, relentless, Herculean, monumental, colossal

demanding, trying, tough, challenging, exacting, overwhelming

exhausting, wearying, fatiguing, tiring, punishing, gruelling, grinding

informal killing, no picnic

British informal knackering

rare toilsome, exigent

ANTONYMS

easy

3‘a formidable opponent’

SYNONYMS

capable, able, proficient, adept, adroit, accomplished

impressive, strong, powerful, mighty, terrific, tremendous, great, redoubtable, indomitable, invincible

seasoned, skilful, skilled, gifted, talented, masterly, virtuoso, expert, knowledgeable, qualified, trained

efficient, good, excellent, brilliant, outstanding, first-class, first-rate

informal mean, wicked, deadly, nifty, crack, ace, stellar, wizard, magic

North American informal crackerjack, badass

vulgar slang shit-hot

archaic, humorous compleat

rare habile

ANTONYMS

weak