Phrase guide

castle in the air

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

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: /ˈkɑːs(ə)l ɪn ðiː ˈɛə/
  • General-American: /ˈkæs(ə)l ɪn ði ˈɛəɹ/
  • Australia: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.

Definition source: English Wiktionary via Wiktextract

Usage: idiomatic

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: air castle, castles in Spain, castle in the skies, eggs in moonshine, jam tomorrow, pie in the sky, pipe dream

Antonyms: terra firma, on solid ground

2

noun

Meaning 2

absentminded dreaming while awake

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: reverie, revery, daydream, daydreaming, oneirism, air castle, castle in Spain

Antonyms: none provided

Broader terms: dream, dreaming

History

Etymology

No etymology was provided for this word.

Across languages

Translations

32 source translations are retained for this English entry.

  • Albanian: kështjella në erë — desire, idea, or plan unlikely to ever be realized
  • Albanian: ëndrra në diell — desire, idea, or plan unlikely to ever be realized
  • Catalan: castells en l'aire — desire, idea, or plan unlikely to ever be realized
  • Chinese Mandarin: 空中樓閣 /空中楼阁 (kōngzhōnglóugé) — desire, idea, or plan unlikely to ever be realized
  • Czech: vzdušné zámky — desire, idea, or plan unlikely to ever be realized
  • Danish: luftkastel — desire, idea, or plan unlikely to ever be realized
  • Dutch: luchtkasteel — desire, idea, or plan unlikely to ever be realized
  • Esperanto: aerkastelo — desire, idea, or plan unlikely to ever be realized
  • Esperanto: ĥimero — desire, idea, or plan unlikely to ever be realized
  • Faroese: harraborg — desire, idea, or plan unlikely to ever be realized
  • Faroese: skýborg — desire, idea, or plan unlikely to ever be realized
  • Finnish: tuulentupa — desire, idea, or plan unlikely to ever be realized
  • Finnish: pilvilinna — desire, idea, or plan unlikely to ever be realized
  • French: châteaux en Espagne — desire, idea, or plan unlikely to ever be realized
  • Galician: castelos no ar — desire, idea, or plan unlikely to ever be realized
  • German: Luftschloss — desire, idea, or plan unlikely to ever be realized
  • German: Traumschloss — desire, idea, or plan unlikely to ever be realized
  • Hebrew: מִגְדָּל פּוֹרֵחַ בָּאֲוִיר (migdál poréaḥ baAvír) — desire, idea, or plan unlikely to ever be realized
  • Hungarian: légvár — desire, idea, or plan unlikely to ever be realized
  • Icelandic: loftkastali — desire, idea, or plan unlikely to ever be realized
  • Māori: waitara — desire, idea, or plan unlikely to ever be realized
  • Norwegian Bokmål: luftslott — desire, idea, or plan unlikely to ever be realized
  • Norwegian Nynorsk: luftslott — desire, idea, or plan unlikely to ever be realized
  • Polish: marzenie ściętej głowy — desire, idea, or plan unlikely to ever be realized
  • Portuguese: castelo de vento — desire, idea, or plan unlikely to ever be realized
  • Portuguese: castelo no ar — desire, idea, or plan unlikely to ever be realized
  • Russian: возду́шный за́мок (vozdúšnyj zámok) — desire, idea, or plan unlikely to ever be realized
  • Serbo-Croatian: куле у зраку — desire, idea, or plan unlikely to ever be realized
  • Serbo-Croatian: kule u zraku — desire, idea, or plan unlikely to ever be realized
  • Spanish: castillos en el aire — desire, idea, or plan unlikely to ever be realized
  • Spanish: castillos de naipes — desire, idea, or plan unlikely to ever be realized
  • Swedish: luftslott — desire, idea, or plan unlikely to ever be realized