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Definition of insomniac

insomniac

/ɪnˈsɑːm.ni.æk/
in · som · ni · ac
Plural:insomniacs
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insomniac Lexical Profile

insomniac Game Scores & Validity

• noun

1

A person who is regularly unable to sleep or suffers from chronic sleeplessness.

Example

"As a lifelong insomniac, she often reads novels until dawn."

Synonyms
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• adjective

1

Suffering from or characterized by an inability to sleep; sleepless.

Example

"During his insomniac nights, the author wrote some of his most famous chapters."

Synonyms
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Antonyms
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• Nearby Words

insolvency
insolvent
insomnia
insomniac
insourcing
inspect
inspectable

Word Origin & Etymology

Coined in the late 19th century from "insomnia" (from Latin "insomnis", meaning "sleepless", combining "in-" "not" and "somnus" "sleep") plus the suffix "-ac".

Cite this Entry

Wordmom. (2026). Definition of Insomniac. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/insomniac
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