loony

12 synonyms and 1 antonym for loony, grouped by meaning and by how common each one is.

Adj — Crazy or mentally unstable.

Synonyms

Common words most readers know — safe in any writing.

crazy

Still standard English, but they carry more weight.

buggy cracked crackers bats

Precise, but they will stand out — check the sense before using one.

weirdo looney nutcase barmy batty balmy bonkers

Crazy or mentally unstable.

“That's a completely loony idea.”

crazy weirdo looney nutcase buggy barmy batty balmy cracked bonkers crackers bats

Opposites

sane

An informal word for a foolish or unstable person.

“Only a loony would try to cross that river in a storm.”

looney nutcase crazy weirdo

A shortened, informal version of "lunatic."

What does “loony” mean?

The word “loony” means crazy or mentally unstable. In plain terms, crazy, silly, or someone acting that way — used casually, often affectionately.

How do you pronounce “loony”?

“Loony” is pronounced LOO-nee (/ˈluːni/ in IPA).

How do you use “loony” in a sentence?

Here is “loony” used in a sentence: “That's a completely loony idea.”

What part of speech is “loony”?

Depending on how it is used, “loony” can be an adjective and a noun.

How many meanings does “loony” have?

“Loony” has 3 distinct senses listed in this dictionary. The most common is: crazy or mentally unstable.

lunacy

crazy cracked bats sane crackers buggy weirdo batty balmy barmy nutcase bonkers