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Added 9 October 2026

loony

/ˈluːni/ noun

noun Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about loony at Wordnik → Where our words come from →

Someone deranged and possibly dangerous.

adjective

Informal or slang terms for mentally irregular.
it used to drive my husband balmy

Origin

Shortened from lunatic, and likely also from loon ("rascal", and also the bird) + -y.

From Wiktionary, via Kaikki.org (CC BY-SA)

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