utterly
utter + -ly
https://gyazo.com/8cba56eb71ad5559098420bfa3d8d430
source: Wet Beerus GIF by Dragon Ball Super | Gfycat
adverb usually as submodifier
completely and without qualification; absolutely:
完全に, まったく, すっかり (!否定的な意味の語や感情を表す語と主に用いる; → totally)
e.g. he looked utterly ridiculous.