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Added 9 October 2026

insomnia

/ɪnˈsɒmniə/ noun

In Latin: insomnia, insomnietās Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about insomnia at Wordnik → Where our words come from →

A sleeping disorder that is known for its symptoms of unrest and the inability to sleep.
My mother suffers from insomnia.
Temporary inability to sleep.

Origin

Borrowed from Latin īnsomnia, from Latin in- (“without”) + somnus (“sleep”, noun) + -ia, equivalent to in- + somn- + -ia.

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

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