名詞 ataractic:

1. a drug used to reduce stress or tension without reducing mental clarity
   同義詞：tranquilizer, tranquillizer, tranquilliser, antianxiety agent, ataractic drug, ataractic agent

形容詞 ataractic:

1. tending to soothe or tranquilize
   同義詞：ataraxic, sedative, tranquilizing, tranquilising

at.a.rac.tic

adj.（形容詞）
Relating to or producing calmness and peace of mind.
安定的：與精神安定有關(guān)的或使精神安定的
n.（名詞）
A drug that reduces nervous tension; a tranquilizer.
鎮(zhèn)定劑：用以減緩神經(jīng)緊張狀態(tài)的藥物；鎮(zhèn)定藥

來源：
From Greek ataraktos [undisturbed]
源自 希臘語 ataraktos [不受干擾的]
a- [not] * see a-
a- [非] *參見 a-
taraktos [disturbed] from tarassein tarak- [to disturb]
taraktos [受干擾的] 源自 tarassein tarak- [打擾]