Princeton's WordNet

1. absolutely, perfectly, utterly, dead(adverb)

   completely and without qualification; used informally as intensifiers

   "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"

Wiktionary

1. utterly(Adverb)

   completely, entirely, to the fullest extent

Webster Dictionary

1. Utterly(adverb)

   in an utter manner; to the full extent; fully; totally; as, utterly ruined; it is utterly vain

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