
cool (adjective)
calm and tranquil; casual, placid, serene; level-headed and unperturbed, especially in a stressful situation; composed, imperturbable, unruffled; stylish and elegant in a way that draws admiration; fashionable, hip, trendy.

calm and tranquil; casual, placid, serene; level-headed and unperturbed, especially in a stressful situation; composed, imperturbable, unruffled; stylish and elegant in a way that draws admiration; fashionable, hip, trendy.