Entry 1 sense Webster, 1913 Unobtrusive /ŭnˌ-əb-tro͞os'-ĭv/ · Un·ob·tru·sive · IPA /ˌʌnəbˈtɹusɪv/ 01 a. Not obtrusive; not presuming; modest. 1. Not obtrusive; not presuming; modest.