IPA: /ˈʌtərli/
KK: /ˈʌtərli/
Completely or absolutely; used to emphasize the totality of something.
She was utterly amazed by the performance.
Utterly is formed from "utter" (from Old English *uttera*, meaning outer or more external) and "-ly" (a suffix meaning in a manner of). The word "utterly" means in a manner that is completely or fully external, emphasizing totality.
Think of 'utter' meaning completely or fully, and remember that 'utterly' describes something done in a complete manner.