(n.) The quality or state of being tranquil; calmness; composure.

Buddha-like composure Oriental calm abnegation abstinence arrangement array ataraxia ataraxy awful silence blank mind blankmindedness blankness calm calm disposition calm of mind calmness comfort composure concord conservatism constraint contemplation continence control cool coolheadedness coolness countenance dead dead of night deathlike silence deployment dispassion disposal disposition ease easy mind emptiness of mind empty-headedness evenness fallow mind fatuity foolishness formation gentleness golden mean golden silence happy medium harmony hush hush of night icy calm impartiality imperturbability imperturbation inactivity inanity inaudibility indisturbance judiciousness juste-milieu law and order layout lenity lineup lucid stillness lull marmoreal repose marshaling meden agan mental blankness mental composure middle way mildness moderateness moderation moderationism mum neutrality nirvana noiselessness nonviolence nothing in excess oblivion order orderliness organization pacifism passivity peace peace and quiet peace of mind peacefulness philosophic composure philosophicalness philosophy placidity placidness proportion prudence quiescence quiescency quiet quiet life quiet mind quietism quietness quietude regularity relaxation repose rest restfulness restraint routine sangfroid satori self-abnegation self-control self-denial self-restraint serenity setup silence silentness silken repose sleep slumber sobriety solemn silence soothingness soundlessness stability steadiness still stillness structure symmetry system tabula rasa tacitness taciturnity temperance temperateness thoughtfreeness thoughtlessness tomblike silence unbuttoned ease unexcessiveness unextravagance unextremeness uniformity unintelligence unruffledness vacancy vacuity via media whisht wise passiveness