Synonyms for Formidable:

• adj.

  •amazing (adjective)
  • awesome.
  •ambitious (adjective)
  • grandiose,
  • impressive,
  • severe,
  • strenuous.
  •dangerous (adjective)
  • portentous,
  • ugly,
  • parlous,
  • Jeopardous.
  •difficult (adjective)
  • adverse,
  • arduous,
  • bothersome,
  • burdensome,
  • cantankerous,
  • complex,
  • complicated,
  • contrary,
  • cumbersome,
  • demanding,
  • difficult,
  • effortful,
  • finicky,
  • fussy,
  • grinding,
  • hard,
  • harsh,
  • immense,
  • knotty,
  • laborious,
  • onerous,
  • oppressive,
  • rough,
  • rugged,
  • severe,
  • strenuous,
  • stressful,
  • thorny,
  • ticklish,
  • tight,
  • toilsome,
  • tough,
  • tricky,
  • troublesome,
  • trying,
  • uphill,
  • wearing,
  • wearisome,
  • wearying,
  • Operose,
  • stiff,
  • Difficile,
  • not easy.
  •difficult, overwhelming (adjective)
  • all-powerful,
  • arduous,
  • awesome,
  • challenging,
  • colossal,
  • effortful,
  • great,
  • hard,
  • impressive,
  • indomitable,
  • labored,
  • laborious,
  • mammoth,
  • mighty,
  • onerous,
  • overpowering,
  • powerful,
  • puissant,
  • rough,
  • staggering,
  • strenuous,
  • tall order,
  • toilsome,
  • tough,
  • tremendous,
  • uphill,
  • murder,
  • ballbuster,
  • rough go,
  • tough proposition.
  •fearful (adjective)
  • grisly.
  •fearsome (adjective)
  • fearsome,
  • frightening.
  •horrible, terrifying (adjective)
  • appalling,
  • awful,
  • dangerous,
  • daunting,
  • dire,
  • dismaying,
  • dreadful,
  • fearful,
  • fierce,
  • frightful,
  • horrific,
  • imposing,
  • impregnable,
  • intimidating,
  • menacing,
  • redoubtable,
  • shocking,
  • terrible,
  • terrific,
  • threatening.
  •invulnerable (adjective)
  • immune,
  • impenetrable,
  • impervious,
  • indestructible,
  • invincible,
  • invulnerable,
  • unbeatable.
  •powerful (adjective)
  • all-powerful,
  • dominant,
  • elevated,
  • front line,
  • great,
  • important,
  • influential,
  • overpowering,
  • unaccountable,
  • untouchable.
  •strong (adjective)
  • brawny,
  • energetic,
  • firm,
  • husky,
  • mettlesome,
  • mighty,
  • muscular,
  • potent,
  • powerful,
  • robust,
  • sinewy,
  • stable,
  • stout,
  • strong,
  • sturdy,
  • vigorous,
  • virile,
  • vital,
  • well-founded,
  • well-established,
  • tough.

• n.

  •
  • fearful,
  • forbidding,
  • impregnable.
  •
  • overwhelming.
  •
  • awesome,
  • imposing.
  •
  • appalling,
  • dire,
  • direful,
  • dreadful,
  • fearsome,
  • frightful,
  • ghastly,
  • scary.
  •
  • backbreaking,
  • effortful,
  • exacting,
  • exigent,
  • heavy,
  • rigorous,
  • taxing,
  • weighty.
  •formidable (noun)
  • alarming,
  • impressive,
  • redoubtable,
  • unnerving.

• Other synonyms:

  •
  • awesome,
  • backbreaking,
  • direful,
  • effortful,
  • fearsome,
  • scary.
  •
  • fearful,
  • terrible.
  •
  • appalling,
  • dire,
  • exigent,
  • ghastly,
  • rigorous,
  • weighty.
  •
  • dreadful,
  • exacting,
  • frightful,
  • taxing.
  •
  • heavy.
  •challenging
  • ambitious.
  •tall
  • high.
  •Other relevant words:
  • abstruse,
  • affecting,
  • alarming,
  • all-powerful,
  • amazing,
  • ambitious,
  • appalling,
  • astonishing,
  • astounding,
  • authoritative,
  • awe-inspiring,
  • awesome,
  • awful,
  • backbreaking,
  • bloodthirsty,
  • breathtaking,
  • brutal,
  • brutish,
  • challenging,
  • colossal,
  • compelling,
  • conspicuous,
  • convincing,
  • crabbed,
  • critical,
  • cruel,
  • crushing,
  • danger,
  • dangerous,
  • daunting,
  • delicate,
  • devastating,
  • devilish,
  • dire,
  • direful,
  • dismaying,
  • distressing,
  • dominant,
  • dread,
  • dreaded,
  • dreadful,
  • earnest,
  • earthshaking,
  • eerie,
  • effective,
  • effectual,
  • efficacious,
  • effortful,
  • egregious,
  • elevated,
  • enormous,
  • evocative,
  • exacting,
  • exceptional,
  • exciting,
  • exhausting,
  • exigent,
  • extraordinary,
  • fabulous,
  • fantastic,
  • fantastical,
  • fatal,
  • fateful,
  • fearful,
  • fearsome,
  • fell,
  • feral,
  • ferocious,
  • fierce,
  • forbidding,
  • forceful,
  • freaky,
  • frightening,
  • frightful,
  • front line,
  • ghastly,
  • ghoulish,
  • gigantic,
  • glorious,
  • grandiose,
  • grave,
  • great,
  • grim,
  • grisly,
  • gruelling,
  • gruesome,
  • hair-raising,
  • hairy,
  • hard-fought,
  • harrowing,
  • heartless,
  • heavy,
  • herculean,
  • hideous,
  • high,
  • homicidal,
  • horrendous,
  • horrible,
  • horrid,
  • horrific,
  • horrifying,
  • huge,
  • illustrious,
  • immense,
  • important,
  • imposing,
  • impregnable,
  • impressive,
  • incredible,
  • indomitable,
  • influential,
  • inhuman,
  • intimidating,
  • intricate,
  • irresistible,
  • knotted,
  • labored,
  • largish,
  • lurid,
  • macabre,
  • mammoth,
  • marked,
  • marvellous,
  • marvelous,
  • mean,
  • menacing,
  • merciless,
  • mind-blowing,
  • mind-boggling,
  • monstrous,
  • monumental,
  • morbid,
  • mountainous,
  • moving,
  • murderous,
  • notable,
  • noteworthy,
  • noticeable,
  • outstanding,
  • overpowering,
  • overwhelming,
  • painful,
  • painfully,
  • parlous,
  • perilous,
  • persuasive,
  • petrifying,
  • pitiless,
  • portentous,
  • prodigious,
  • profound,
  • provocative,
  • puissant,
  • redoubtable,
  • remarkable,
  • revolting,
  • rigorous,
  • rude,
  • ruthless,
  • savage,
  • scary,
  • serious,
  • shocking,
  • signal,
  • slavish,
  • sober,
  • solemn,
  • spiny,
  • spooky,
  • squally,
  • staggering,
  • startling,
  • steep,
  • sticky,
  • stiff,
  • stimulating,
  • stirring,
  • striking,
  • stunning,
  • stupefying,
  • stupendous,
  • substantial,
  • superior,
  • sweaty,
  • tall order,
  • taxing,
  • telling,
  • terrible,
  • terrific,
  • terrifying,
  • threatening,
  • tiring,
  • titanic,
  • towering,
  • tremendous,
  • trenchant,
  • ugly,
  • unaccountable,
  • unbearable,
  • unbelievable,
  • uncommon,
  • uncontrollable,
  • unendurable,
  • unmistakable,
  • unnerving,
  • untouchable,
  • very much,
  • vicious,
  • violent,
  • weighty,
  • well-connected,
  • well-founded,
  • wicked,
  • wonderful,
  • wondrous,
  • Arousing,
  • Difficile,
  • Fatiguing,
  • Fiendish,
  • Irksome,
  • Jeopardous,
  • Moiling,
  • Operose,
  • hellacious,
  • pick-and-shovel,
  • hard-earned,
  • well-established,
  • murder,
  • of mark,
  • unmistakeable,
  • ballbuster,
  • full of energy,
  • no picnic,
  • not easy,
  • rough go,
  • tough proposition,
  • back-breaking.

Antonyms for Formidable:

• adj.

  • difficult, overwhelming
    facile.
  • horrible, terrifying
    easy, feeble, friendly, harmless, powerless, weak.
  • Other antonyms:
    accessible, achievable, calming, cheap, clear, consoling, contemptible, despicable, doable, easy, effortless, elementary, facile, feeble, friendly, gentle, harmless, helpless, inviting, light, lulling, manageable, mindless, pacifying, painless, powerless, reassuring, relaxed, relaxing, simple, smooth, soft, soothing, tranquilizing, unalarming, uncomplicated, undemanding, unimpressive, user-friendly, weak, comforting.