"tranquilising" in the adjective sense
1. ataractic, ataraxic, sedative, tranquilizing, tranquillizing, tranquilising, tranquillising
tending to soothe or tranquilize
"valium has a tranquilizing effect"
"took a hot drink with sedative properties before going to bed"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License