diabolically
Concise Oxford English Dictionary © 2008 Oxford University Press:
diabolical/dʌɪəˈbɒlɪkl/
▶adjective
- 1 (also diabolic) characteristic of or associated with the Devil: diabolical cunning.
- 2 Brit. informal disgracefully bad or unpleasant.
– derivatives
diabolically adverb.
diabolically adverb.
– origin ME: from OFr. diabolique or eccles. L. diabolicus, from diabolus ‘devil’.
'diabolically' also found in these Oxford entries:

