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Longman Dictionary of Contemporary English
clear-headed
adjective
EXAMPLES FROM CORPUS
▪ Being clear-headed and aware of his or her own feelings, needs and resources, skills and deficiencies.
▪ Family ties, however, did not prevent Victoria's clear-headed assessment that intervention was useless.
▪ On the eighth day, she felt her normal, clear-headed self again.
▪ One has to be very clear-headed to do what I am doing.
▪ The impression that a simple one-sided morality is of itself nobler and more clear-headed than a complex one is false.
▪ They needed no professional help with the evening's drinking but arose magically clear-headed and eagle-eyed for each subsequent day's golf.
▪ Though very seriously ill, she was clear-headed and rational.
▪ What a useful, reliable, clear-headed son.
The Collaborative International Dictionary
Clear-headed

Clear-headed \Clear"-head`ed\ (kl[=e]r"h[e^]d`[e^]d), a. Having a clear understanding; quick of perception; intelligent. ``He was laborious and clear-headed.''
--Macaulay. -- Clear"-head`ed*ness, n.

Wiktionary
clear-headed

a. (alternative spelling of clearheaded English)

Usage examples of "clear-headed".

It is impossible for any clear-headed person to suppose that the ever more destructive stupidities of war can be eliminated from human affairs until some common political control dominates the earth, and unless certain pressures due to the growth of population, due to the enlarging scope of economic operations or due to conflicting standards and traditions of life, are disposed of.

He gave in detail the ideas that were current among retailers and consumers regarding shape and finish of scythes, putting it down in a clear-headed way, so that a baby could have understood him, but showing the shrewdness of a man who was studying all the points in connection with his trade.

Ted Pitts, short-sighted, clear-headed, bi-lingual in English and algebra.

And, Tabini-ma, consider that I've been out of the information loop for days, I've been hours under anesthetic, I've had a pain pill and I'm not clear-headed at the moment.

It seemed that the bright sunlight, magnified by the lingering moisture in the air, burned away the mists from his mind and the poisonous miasma from his blood, leaving him clear-headed, with a fragile sense of well-being but a weakness in his legs and arms and a dull ache up under the right-hand side of his rib cage where his liver was still swollen and hard as a rock, the typical after-effect of the fever.