having common sense and sound judgment; sensible.

1875–80, Americanism; level + head + -ed3

levelheadedly, adverb
levelheadedness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To levelheaded
Word Origin & History

also level-headed, 1876, from level (adj.) + head (n.). The notion is of "balanced."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Attempts at remaining levelheaded were abandoned months ago.
There was heat in the room, to be sure, but the levelheaded moderator kept
  things on track and respectful.
All us mature, levelheaded, pragmatic readers are rooting for you.
He operates in a stratosphere that is insane, and yet this guy is so
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