in a terrible manner.
Informal. extremely; very: It's terribly late. I'm terribly sorry.

1520–30; terrible + -ly

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terribly (ˈtɛrəblɪ)
1.  in a terrible manner
2.  (intensifier): you're terribly kind

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"dreadfully," 1520s, see terrible; in the sense of "extremely" it is first recorded 1833; in the sense of "extremely badly" it dates from 1930.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
As with our sister agencies, our thoughts and prayers go out to the families so
  terribly affected by this storm.
Until recently, the road was so terribly rutted and narrow that the trip took
  eleven hours.
It took me a long time to realize that she was terribly overrated as a writer.
And, in this case, there is terribly little evidence.
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