Standard Lemma guide

moonstruck

adj · 4 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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /ˈmuːnstɹʌk/
  • General-American: /ˈmunˌstɹʌk/
  • General-American: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: M UW1 N S T R AH2 K Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adj

Meaning 1

Of a person: perverted or insane, originally supposedly due to the influence of the Moon; compare lunatic.

Definition source: English Wiktionary via Wiktextract

Usage: archaic

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: lunatic, moonstricken

Antonyms: none provided

2

adj

Meaning 2

Showing irrational behaviour, especially of a romantic or sentimental nature; in an entranced or distracted state, especially due to being in love.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: moonstricken

Antonyms: none provided

3

adj

Meaning 3

Made physically sick, or (like fish) unsuitable for food, by the supposed effect of moonlight.

Definition source: English Wiktionary via Wiktextract

Usage: regional

Qualifier: obsolete except UK

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

adjective satellite

Meaning 4

insane and believed to be affected by the phases of the moon

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: lunatic

Antonyms: none provided

History

Etymology

From moon + struck (adjective), possibly coined by the English poet and polemicist John Milton (1608–1674): see the quotation. Compare Byzantine Greek σεληνόβλητος (selēnóblētos), σεληνόπληκτος (selēnóplēktos), German mondsüchtig, and German Low German maansüchtig, which also refer to being struck by the moon.

Across languages

Translations

11 source translations are retained for this English entry.

  • Danish: månesyg — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Finnish: kuuhullu — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • French: lunatique — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • German: mondsüchtig — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Italian: lunatico — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Latin: lunaticus — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Old English: mōnaþsēoc — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Portuguese: lunático — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Russian: лунатик (lunatik) — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Welsh: lloerig — of a person: crazy or insane, originally supposedly due to the influence of the Moon — see also crazy, insane
  • Finnish: lääpällään — showing irrational behaviour, especially of a romantic or sentimental nature; in an entranced or distracted state, especially due to being in love