ˈflætnəs ɪnəˈnɪʃən ˈlæsɪˌtjuːd ˈlɛθ.ə(ɹ).d͡ʒi flɛm ˈslæknəs inactivity; showing an unusual lack of energy the general appearance of sluggishness alarmed his friends weakness characterized by a lack of vitality or energy a state of comatose torpor (as found in sleeping sickness)