Etymology
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terribly (adv.)

"dreadfully, so as to cause terror, in a horrible manner," mid-15c., from terrible + -ly (2). In the sense of "extremely" it is first recorded 1833; in the sense of "extremely badly" it dates from 1930.

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Definitions of terribly

terribly (adv.)
used as intensifiers;
terribly interesting
Synonyms: awfully / awful / frightfully
terribly (adv.)
in a terrible manner;
she sings terribly
Synonyms: atrociously / awfully / abominably / abysmally / rottenly
From wordnet.princeton.edu