Entry 1 sense Webster, 1913 Utterly · Ut·ter·ly · IPA /ˈʌt.ə(ɹ).li/ 01 adv. In an utter manner; to the full extent; fully; totally; as, utterly ruined; it is utterly vain. 1. In an utter manner; to the full extent; fully; totally; as, utterly ruined; it is utterly vain.