Definition of terribly adverb from the Oxford Advanced American Dictionary

      

    terribly

     adverb
    adverb
    NAmE//ˈtɛrəbli//
     
     
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  1. 1 very I'm terribly sorry—did I hurt you? It's terribly important for parents to be consistent. I'm not terribly interested in politics.
  2. 2very much; very badly I miss him terribly. They suffered terribly when their son was killed. The experiment went terribly wrong. Would you mind terribly if I didn't come today?
See the Oxford Advanced Learner's Dictionary entry: terribly