blue-sky

American  

[bloo-skahy] / ˈbluˈskaɪ /

adjective

1. fanciful; impractical.

   blue-sky ideas.

2. (especially of securities) having dubious value; not financially sound.

   a blue-sky stock.

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blue-sky British  

noun

1. (modifier) of or denoting theoretical research without regard to any future application of its result

   a blue-sky project

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verb

1. to theorize (about something that may not lead to any practical application)

Etymology

Origin of blue-sky

First recorded in 1890–95

Example Sentences

See Examples For:

blue-sky

Many firms deliberately hold blue-sky sessions where participants are asked to voice ideas they would normally suppress fearing colleague ridicule.

From The Wall Street Journal ● Sep. 8, 2026

Sillie posted a second video, the cellphone panning to the ruins against a blue-sky backdrop.

From Los Angeles Times ● Jun. 30, 2026

For hours on a crisp, blue-sky day, kite flyers mingled with sign-wavers, sharing space on the National Mall as they pursued their dueling missions.

From Barron's ● Mar. 28, 2026

Some of this is blue-sky thinking about the future.

From BBC ● Mar. 20, 2026

And probably never even heard the blue-sky sound on their trumpets.

From "Maybe He Just Likes You" by Barbara Dee

Related Words

• absurd
• bizarre
• extravagant
• fantastic
• fantastical
• fictional
• imaginative
• offbeat
• preposterous
• unreal
• whimsical