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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adverbial terrifically has 1 sense

• terrifically(r = adv.all) marvellously, marvelously, superbly, toppingly, wonderfully, wondrous, wondrously - (used as an intensifier) extremely well; "her voice is superbly disciplined"; "the colors changed wondrously slowly"

CIDE DICTIONARY

THESAURUS

terrifically

alarmingly, almighty, appallingly, astoundingly, awfully, disconcertingly, dismayingly, divinely, dreadfully, exceedingly, exquisitely, fearfully, frightfully, gloriously, horrendously, horribly, horridly, horrifically, horrifyingly, immensely, just, magnificently, marvelously, mightily, mighty, only too, powerful, powerfully, pretty, quite, real, really, right, shockingly, so, startlingly, superbly, terribly, tremendously, very, wonderfully

For further exploring for "terrifically" in Webster Dictionary Online