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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.

Synonyms:

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

dreadful, terrible, alarming, ghastly, hideous, awful, unpleasant, dire, repulsive, horrible, horrid, appalling

Usage examples:

• But the last part of my journey was frightful. - "The Reclaimers", Margaret Hill McCarter.
• It- it's such a frightful responsibility." - "The Keeper of the Door", Ethel M. Dell.
• After this exploit the huntsmen, anxious to discover the child whose cries resounded in this frightful habitation, eagerly descended into it. - "Eastern Tales by Many Story Tellers", Various.