adj.
Pronunciation: ˌ d ī - ə - ' bä-li-k ə l
Variant: or di · a · bol · ic \ - ' bä-lik \
Function: adjective
Etymology: Middle English deabolik, from Middle French diabolique, from Late Latin diabolicus, from diabolus
Date: 14th century
: of, relating to, or characteristic of the devil : DEVILISH <a diabolical plot>
– di · a · bol · i · cal · ly \ -li-k( ə -)l ē \ adverb
– di · a · bol · i · cal · ness \ -li-k ə l-n ə s \ noun