Definition of terrifically in US English:

terrifically

adverb

  • 1With great intensity; to a great extent.

    ‘incendiary bombs flashed terrifically’
    ‘the system was expanding terrifically’
    as submodifier ‘I feel terrifically frustrated’
    • ‘I was terrifically hungry.’
    • ‘It's terrifically difficult for her to cross the sitting-room to her favorite chair.’
    • ‘That angers me terrifically.’
    • ‘The seat is terrifically frayed, almost threadbare now.’
    • ‘The story here isn't terrifically bad, but it's not terrifically believable, either.’
    1. 1.1informal In an extremely good way.
      ‘she is doing terrifically in the show’
      as submodifier ‘a terrifically entertaining novel’
      ‘Sue and I get along terrifically well’
      • ‘The play is a terrifically funny work that can survive ham-fisted ad-libs.’
      • ‘We've used it for about 8 months now and it appears to work terrifically.’
      • ‘We all got along terrifically, and I had a great time.’
      • ‘The scene is terrifically done: in her body language you can see that her heart and head are telling her completely different things.’
      • ‘She gives her best performance yet in this terrifically acted relationship drama set in the Australian desert.’
      • ‘The orchestra, to a man, played terrifically - the best I have heard it yet.’

Pronunciation

terrifically

/təˈrɪfɪk(ə)li//təˈrifik(ə)lē/