horribly
Concise Oxford English Dictionary © 2008 Oxford University Press:
horrible/ˈhɒrəbl/
▶adjective
- 1 causing or likely to cause horror.
- 2 very unpleasant.
– derivatives
horribleness noun,
horribly adverb.
horribleness noun,
horribly adverb.
'horribly' also found in these Oxford entries:

