Word Study
level-headed
OXFORD DICTIONARY
level-headed, adj. mentally well-balanced, cool, sensible.
Derivative
level-headedly adv. level-headedness n.
THESAURUS
level-headed
calm, collected, composed, cool, even-tempered, imperturbable, level, poised, reasonable, relaxed, sane, self-possessed, sensible, serene, tranquil, undisturbed, unflappable, unperturbed, unruffled, well-balancedFor further exploring for "level-headed" in Webster Dictionary Online