(a.) Quiet; calm; undisturbed; peaceful; not agitated; as, the atmosphere is tranquil\; the condition of the country is tranquil.

at peace at rest blank blankminded bloodless calm cloistered collected composed concordant cool coolheaded dispassionate dwindling easy easygoing ebbing empty empty-headed equable even even-tempered even-tenored fatuous halcyon hushed idyllic impassive inane incogitant irenic isolated levelheaded moldering nirvanic oblivious orderly pacific passive pastoral peaceable peaceful peacetime philosophical piping placid poised possessed quiescent quiet quietistic regular relaxed reposeful reposing restful resting secluded sedate self-controlled self-possessed sequestered sequestrated serene sheltered smooth soft stable steady still still as death stillish stilly stoic stolid subsiding thoughtfree thoughtless unagitated undisturbed unexcited unideaed unintellectual unmoved unoccupied unperturbed unreasoning unruffled unstirring unthinking untroubled vacant vacuous waning