Terrifically

Adverb

 * 1) In a terrific or extreme way.
 * "The test was terrifically hard", said the tired student.

Thesaurus
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