adj. 25B6; adjective
on the surface she seemed serene : CALM, composed, tranquil, peaceful, untroubled, relaxed, at ease, unperturbed, unruffled, unworried; placid, equable; N. Amer. centered; informal together, unflappable.
serene valleys : PEACEFUL, tranquil, quiet, still, restful, relaxing, undisturbed.
agitated, turbulent.