Entry 1 sense Webster, 1913 Unbecoming /ŭnˌ-bĭk-ŭm'-ĭng/ · Un·be·com·ing · IPA /ˌʌnbɪˈkʌmɪŋ/ 01 a. Not becoming; unsuitable; unfit; indecorous; improper. 1. Not becoming; unsuitable; unfit; indecorous; improper. “My grief lets unbecoming speeches fall.” — Dryden.