Entry 1 sense Webster, 1913 lasciviousness · las·civ·i·ous·ness · IPA /ləˈsɪvi.əsnəs/ 01 n. The state or habitual condition of feeling an excessive or morbid sexual desire. 1. The state or habitual condition of feeling an excessive or morbid sexual desire. Syn. prurience, pruriency, carnality.