-blē, -bli adverb
Etymology: terrible (I) + -ly
1. : in a formidable or frightening manner : awesomely , terrifyingly
the terribly glittering advance of a tidal wave
the fear is terribly mutual — Hal Lehrman
2.
a. : to a superlative degree : extremely , intensely
it is terribly difficult to translate poetry — Gilbert Highet
the reaction of a terribly sincere spirit to something … sham and sophisticated — Herbert Read
an eight-five cent dinner that was terribly good and quick — Mary McCarthy
b. : to an excruciating or shocking extent : appallingly
wars … aggravated matters terribly — E.B.George
the story is terribly involved — Roger Fry
played pinochle, and … cheated terribly — Edita Morris