TRANQUIL

adj. calm, serene, placid, quiet, peaceful, still, smooth, unagitated, halcyon, relaxed; unruffled, sedate, steady, regular, even, dispassionate, self-possessed, cool, self-controlled, cool-headed, unexcited, undisturbed, untroubled, unperturbed He often thought back to the tranquil, sultry summer days of his youth How can Eleanor be so tranquil when everything about her is so chaotic?