副词

1. 全然；完全地；彻底地
You use utterly to emphasize that something is very great in extent, degree, or amount.

1. completely and without qualification
used informally as intensifiers

e.g. an absolutely magnificent painting
a perfectly idiotic idea
you're perfectly right
utterly miserable
you can be dead sure of my innocence
was dead tired
dead right

Synonym: absolutelyperfectlydead