adjective
reasonable, calm
Synonyms: all there, balanced, collected, commonsensical, composed, cool, cool as cucumber, coolheaded, dependable, discreet, even-tempered, far-sighted, in one’s right mind, judicious, practical, prudent, rational, sane, self-possessed, sensible, steady, together, unflappable, wise, with all marbles
Antonyms: nervous, unreasonable, upset
adjective
calm
Synonyms: all there, balanced, collected, commonsensical, composed, cool, coolheaded, dependable, discreet, even-tempered, farsighted, judicious, practical, prudent, rational, reasonable, sane, self-possessed, sensible, steady, together, unflappable, wise
Antonyms: excitable