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Definition of frightful:

  1. Full of fright; affrighted; frightened.
  2. Full of that which causes fright; exciting alarm; impressing terror; shocking; as, a frightful chasm, or tempest; a frightful appearance.


stately, marvellous, grand, tremendous, fantastic, enormous, uncanny, timorous, ominous, hair-raising, howling, majestic, horrific, frightening, worthless, horrifying, extraordinary, august, awing, fear, surly, amazing, alarming, awesome, wondrous, macabre, atrocious, portentous, flagitious, fearsome, spooky, cowardly, repellent, inconceivable, wretched, wicked, solemn, shocking, nasty, good, horrendous, imposing, scary, unspeakable, charming, bloodcurdling, terrible, bad, painful, formidable, rattling, disturbing, eerie, harrowing, severe, horrible, dreaded, calamitous, awe-inspiring, unworthy, gruesome, despicable, grievous, noble, dread, offensive, disquieting, monstrous, demoralizing, terrific, awed, trepid, weird, redoubtable, marvelous, grisly, lurid, vile, ugly, abominable, wonderful, slimy, direful, fearful.

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