Synonyms and related words :
assured, balanced, coequal, collected, commonsense, composed, confident, cool, coolheaded, coordinate, equal, equanimous, equilateral, equilibrious, eurythmic, even, fast, fiducial, finished, firm, firm as Gibraltar, harmonious, imperturbable, in equilibrium, levelheaded, logical, philosophical, poised, practical, pragmatic, predictable, proportioned, rational, reasonable, recollected, regular, reliable, sane, secure, self-assured, self-confident, self-controlled, self-possessed, self-restrained, sensible, sober, sober-minded, solid, sound, stable, steadfast, steady, substantial, symmetric, together, unflappable, unflinching, uniform, unshakable, unwavering, well-set, well-set-up, without nerves