Head in the clouds
Meaning
Daydreaming or unrealistic.
Usage
Used to describe impractical optimism.
Origin & History
Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.
Sky imagery representing detached thinking.
Appeared in romantic poetry of the 19th century.