Synonyms of terribly in English:

terribly


See definition of terribly

adverb

1‘she's terribly upset’

SYNONYMS
very, extremely, awfully, dreadfully, really, frightfully, exceptionally, exceedingly, immensely, thoroughly, uncommonly, remarkably, eminently, extraordinarily, incredibly, most, positively, decidedly, downright
heartily, profoundly
Scottish unco
North American quite
informal terrifically, tremendously, fearfully, desperately, seriously, devilishly, hugely, fantastically, madly, ultra, too … for words, mucho, mega, majorly, oh-so, stinking
British informal jolly, ever so, dead, well, fair, right
North American informal real, mighty, awful, plumb, powerful, way, bitching
South African informal lekker
informal, dated devilish
archaic exceeding, sore

2‘he played terribly’

SYNONYMS
very badly, atrociously, awfully, dismally, dreadfully, appallingly, execrably, poorly, incompetently, inexpertly
informal abysmally, pitifully, crummily, diabolically, rottenly
rare egregiously

3‘I shall miss you terribly’

SYNONYMS
very much, greatly, a great deal, a lot, mightily
informal loads