Synonyms for Clearheaded:

adj.

lucid (adjective)
perceptive, composed, unconfused, sensible.

n.

clearheaded (noun)
unclouded, clear, clear-thinking.
lucid (noun)
composed, perceptive, judicious, unconfused, sensible, intelligent.

v.

calm (verb)
composed.

Other synonyms:

intelligent. Other relevant words:
intelligent, sensible, perceptive, unconfused, composed.

Usage examples for clearheaded

  1. His meaning is occasionally obscure, but in my opinion he is gifted with a clearheaded knowledge of the world quite unusual in one of his apparent age. – Trent's Last Case The Woman in Black by E.C. (Edmund Clerihew) Bentley