castle in the air
Noun
Meaning
absentminded dreaming while awake
Source: WordNetSynonyms
daydream
reverie
daydreaming
revery
oneirism
air castle
castle in Spain
mirage
chimera
phantasy
chimaera
dream
fantasy
imagination
bubble
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Antonyms
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Examples
Idealism is like a castle in the air if it is not based on a solid foundation of social and political realism.
A neurotic is a man who builds a castle in the air. A psychotic is the man who lives in it. A psychiatrist is the man who collects the rent.