unobtrusive adj. + Add to list US //ˌənəbˈtɹusɪv// UK //ʌnɒbtɹˈuːsɪv// un·ob·tru·sive SynonymsAntonymsEtymology Synonyms unnoticeable Antonyms obtrusiveOrigin From un- (prefix meaning ‘not’) + obtrusive.