ter ‧ ri ‧ bly S2 /ˈterəbli, ˈterɪbli/ BrE AmE adverb
1 . [+ adjective/adverb] especially British English very SYN extremely :
I’m terribly sorry to have kept you waiting.
The coach was not terribly worried about his team’s poor performance.
2 . very badly SYN severely :
The little boy missed his mother terribly.