Standard Lemma guide

sundowning

noun · verb · 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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1

noun

Meaning 1

A state of agitation, confusion, or delirium, especially in patients suffering from Alzheimer's disease, which begins each evening and which is alleviated by daylight.

Definition source: English Wiktionary via Wiktextract

Usage: uncountable

Topics: human-sciences, medicine, psychiatry, psychology, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: nocturnal delirium, sundowner syndrome

Antonyms: none provided

2

verb

Meaning 2

present participle and gerund of sundown

Definition source: English Wiktionary via Wiktextract

Usage: form-of, gerund, participle, present

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From sundown + -ing.

Across languages

Translations

6 source translations are retained for this English entry.

  • Chinese Mandarin: 日落綜合徵 /日落综合征 — nightly agitation, confusion, or delirium
  • Chinese Mandarin: 日落綜合症 /日落综合症 — nightly agitation, confusion, or delirium
  • Chinese Mandarin: 日落症候群 — nightly agitation, confusion, or delirium
  • Finnish: auringonlaskuoireyhtymä — nightly agitation, confusion, or delirium
  • Japanese: 日暮れ時兆候 (higure-doki chōkō) — nightly agitation, confusion, or delirium
  • Polish: zespół zachodzącego słońca — nightly agitation, confusion, or delirium