Synonyms for Terrifically:

• adv

  •certainly (adverb)
  • decidedly.
  •extremely (adverb)
  • nth degree.

• adv.

  •decidedly (adverb)
  • bloody,
  • absolutely,
  • powerful,
  • really,
  • sure,
  • strongly,
  • positively,
  • real,
  • surely,
  • of course,
  • distinctly,
  • flat out,
  • clearly,
  • right,
  • downright.
  •extremely (adverb)
  • immoderately,
  • exorbitantly,
  • ultra,
  • mortally,
  • over,
  • very,
  • surpassingly,
  • to nth degree,
  • quite,
  • unusually,
  • inordinately,
  • immensely,
  • too,
  • extraordinarily,
  • violently,
  • severely,
  • vitally,
  • utterly,
  • prohibitively,
  • extremely,
  • uncommonly,
  • notably,
  • intensely,
  • markedly,
  • rarely,
  • strikingly,
  • parlous,
  • exceptionally,
  • overly,
  • almighty,
  • drastically,
  • awfully,
  • too much,
  • radically,
  • exceedingly,
  • overmuch,
  • plenty,
  • acutely,
  • unduly,
  • highly,
  • totally,
  • excessively,
  • hugely.
  •highly (adverb)
  • deeply,
  • mucho,
  • supremely,
  • very much,
  • but good,
  • jolly,
  • eminently,
  • profoundly,
  • so much,
  • so,
  • awful,
  • tremendously,
  • mighty,
  • vastly.
  •unusually (adverb)
  • extra,
  • strangely,
  • oddly,
  • peculiarly,
  • uncommon,
  • especially.

• n.

  •frightfully (noun)
  • mightily,
  • horribly,
  • badly.
  •marvellously (noun)
  • marvellously.

• Other synonyms:

  •Other relevant words:
  • desperately,
  • massively,
  • furiously,
  • enormously,
  • dismayingly,
  • like mad,
  • pretty,
  • fearfully,
  • awesomely,
  • fabulously,
  • formidably,
  • amazingly,
  • merrily,
  • shockingly,
  • finely,
  • Fantasticly,
  • frightfully,
  • horridly,
  • exquisitely,
  • startlingly,
  • desperate,
  • powerfully,
  • grimly,
  • just,
  • astoundingly,
  • hideously,
  • appallingly,
  • horrifically,
  • snappily,
  • improbably,
  • foolishly,
  • sensationally,
  • divinely,
  • alarmingly,
  • stupendously,
  • grotesquely,
  • madly,
  • excellently,
  • disconcertingly,
  • briskly,
  • miraculously,
  • only too,
  • horrendously,
  • horrifyingly,
  • dreadfully,
  • phenomenally,
  • Direly,
  • direfully.

Antonyms for Terrifically:

• adv.

  • decidedly
    doubtfully.
  • extremely
    little, moderately, incompletely, mildly.
  • highly
    unremarkably.
  • unusually
    usually, normally, commonly.