ɪnəˈnɪʃən ˈlæsɪˌtjuːd ˈlaksɪti ˈlɛθ.ə(ɹ).d͡ʒi ɹɪˈmɪsnɪs ˈslæknəs the quality of being lax and neglectful the quality of being loose (not taut) he hadn't counted on the slackness of the rope weakness characterized by a lack of vitality or energy