need one's head examined

Behaving totally irrationally

To need one's head examined is to be acting so foolishly or irrationally that one might be mentally unsound.

The phrase suggests the person's judgment is so poor that a doctor should check for problems: Anyone who thinks that's a good investment needs their head examined.

Often used hyperbolically to express strong disagreement with someone's choices.

Related

mad as a hatter · stark raving mad · not all there · psychological assessment · recklessness · question · off one's rocker · overconfidence · irrationality · heedlessness · common sense · naivety · mental health evaluation · bats in the belfry · out to lunch · absurdity · impulsivity · imprudence

Opposites
mental soundness/rationality

need one's head examinedhave one's wits about one

Remain mentally sharp, attentive

sane · rational · of sound mind · in one's right mind · level-headed

judgment quality

need one's head examinedwise

Showing good judgment

prudent · judicious · shrewd · astute · sagacious

wisdom of decisions/actions

need one's head examinedknow what one is doing

Have mastery in something

use one's head

Family

needs, needed, needing, needless, needlessly, headed, heading, header, headless

Familiarity
Top 200,000
Profile
Used worldwide · Timeless · Negative · Everyday, not technical · Rated G