adj. 1. tending to soothe or calm or tranquilize Syn. -- calming, sedative, soothing, tranquilizing [ WordNet 1.5 ]
n. 1. drug that reduces nervous tension and gives peace of mind. Syn. -- ataractic [ WordNet 1.5 ]
{ ‖ } n. [ NL. ataraxia, Gr. 'ataraxi`a; 'a priv. + tarakto`s disturbed, tara`ssein to disturb. ] Perfect peace of mind, or calmness. [ 1913 Webster ]