1. 
[syn: healthy, intelligent, levelheaded, level-headed, sound]
The Collaborative International Dictionary of English v.0.48:
levelheaded \lev"el*head"ed\ a.
   exercising or showing good judgment or common sense;
   sensible.
   Syn: healthy, intelligent, sound.
        [WordNet 1.5] -- lev"el*head"ed*ly, adv. --
        lev"el*head"ed*ness, n.
        [PJC]
WordNet (r) 3.0 (2006):
levelheaded
    adj 1: exercising or showing good judgment; "healthy
           scepticism"; "a healthy fear of rattlesnakes"; "the
           healthy attitude of French laws"; "healthy relations
           between labor and management"; "an intelligent solution";
           "a sound approach to the problem"; "sound advice"; "no
           sound explanation for his decision" [syn: healthy,
           intelligent, levelheaded, level-headed, sound]
Moby Thesaurus II by Grady Ward, 1.0:
20 Moby Thesaurus words for "level-headed":
   calm, collected, composed, cool, even-tempered, imperturbable,
   level, poised, reasonable, relaxed, sane, self-possessed, sensible,
   serene, tranquil, undisturbed, unflappable, unperturbed, unruffled,
   well-balanced
Moby Thesaurus II by Grady Ward, 1.0:
38 Moby Thesaurus words for "levelheaded":
   assured, balanced, calm, collected, commonsense, composed,
   confident, cool, coolheaded, dispassionate, equable, equanimous,
   equilibrious, even, even-tempered, logical, philosophical, poised,
   practical, pragmatic, rational, reasonable, recollected, reposeful,
   sane, self-assured, self-confident, self-controlled,
   self-possessed, self-restrained, sensible, serene, sober,
   sober-minded, sound, together, tranquil, well-balanced