What is another word for lunatic?

Need synonyms for lunatic? Here's a list of words from our thesaurus that you can use instead.

Having or showing a very abnormal or sick state of mind
“The operation of the market taken to lunatic extremes.”
Showing or marked by a lack of good sense or judgment
“… such lunatic clowning during a solemn ceremony is completely inappropriate.”
A person having or showing a severely disordered or abnormal state of mind
“If he had been psychotic before, he was a fuming lunatic now, Evelyn decided.”
An extremely foolish or eccentric person
“When you see a picture of some mud-spattered lunatic on a 4,000 mile ride through Africa, the lunatic tends to be sitting on a BMW.”
A person who lacks good sense or judgment
“… no, you can't ski off the roof, you lunatic!”
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