tranquil Synonyms

still calm placid quiet unruffled smooth unagitated serene unideaed stiller stilly stoical stolid unruffle stormless temperate unmoved unfrequented unaffected steady self-assured self-possessed settling sleepy smoother soft somnolent soothing soothe soundless staid sedate waveless windless nonviolent unsurprised imperturbable at ease even-tempered unexcitable untroubled unflappable self-controlled unemotional unexcited unflurried unflustered nonbelligerent coolheaded undisturbed