Entry 1 sense Webster, 1913 Restiness /(r?st`ĭ*n?s)/ · Rest·i·ness · IPA /ˈɹɛstɪnəs/ 01 n. The quality or state of being resty; sluggishness. 1. The quality or state of being resty; sluggishness.[Obs.] “The snake by restiness and lying still all winter.” — Holland.