Here's what rhymes with fiendishly.
Words that almost rhyme with fiendishly
sheepishly scenically seemingly secretly feelingly heatedly peevishly freakishly exceedingly fleetingly teasingly pleadingly sweepingly jeeringly sneakingly squeamishly vixenishly unceasingly misleadingly pleasingly appealingly revealingly beseechingly unfeelingly unseeingly deceivingly screamingly overweeningly repeatedly endearingly increasingly strategically obliquity intriguingly decreasingly entreatingly unappealingly disbelievingly tantalisingly