Phrase guide

sleepy sickness

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

An acute inflammation of the brain which causes drowsiness and mental disease.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: encephalitis lethargica, von Economo disease

Antonyms: none provided

2

noun

Meaning 2

an encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: sleeping sickness, epidemic encephalitis, lethargic encephalitis, encephalitis lethargica

Antonyms: none provided

Broader terms: encephalitis, cephalitis, phrenitis

History

Etymology

No etymology was provided for this word.