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.

---

blue-sky British  

noun

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

   a blue-sky project

---

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

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

When an intern tells a patient that he believes kindness is the best medicine, J.D. tersely interrupts his blue-sky meliorism with a cold splash of reality.

From Salon ● Feb. 26, 2026

Strauss, a financier in the 1920s of the city’s skyline, summed up the blue-sky optimism: “New York cannot be held back in her growth and development as the supreme city in the world.”

From The Wall Street Journal ● Nov. 8, 2025

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

From "The One and Only Ivan" by Katherine Applegate

Related Words

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