1) Calmness 2) French word used in English 3) Quiet 4) Quietness 5) Rest 6) Stillness 7) The state of being quiet 8) Tranquil state 9) Tranquility 10) Tranquillity Found on https://www.crosswordclues.com/clue/quietude
Qui'e·tude noun [ Latin quietudo : confer French quiétude .] Rest; repose; quiet; tranquillity. Shelley. Found on http://www.encyclo.co.uk/webster/Q/10