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

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Example Sentences

See Examples For:

blue-sky

Both come at a premium to Bodycote’s share-price lows, but the valuation of the U.K. industrial company could be above 1,000 pence a share—or 1.7 billion pounds—under a blue-sky scenario, they say.

From The Wall Street Journal ● Aug. 6, 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

Adding to the mistrust is that just over 60% of bucket one funding - for blue-sky research - goes directly to universities, who can then spend it how they like.

From BBC ● Mar. 17, 2026

I like colorful tales with black beginnings and stormy middles and cloudless blue-sky endings.

From "The One and Only Ivan" by Katherine Applegate

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Related Words

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

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