Entry 1 sense Webster, 1913 Investigative /ĭnˌ-vĕs'-təg-ātˌ-ĭv/ · In·ves·ti·ga·tive · IPA /ɪnˈvɛstɪɡətɪv/ 01 a. Given to investigation; inquisitive; curious; searching. 1. Given to investigation; inquisitive; curious; searching.