unobservable

adjective
un·​ob·​serv·​able | \ˌən-əb-ˈzər-və-bəl \

Definition of unobservable 

: incapable of being observed : not observable particles so small that they are unobservable

Examples of unobservable in a Sentence

Recent Examples on the Web

Understanding how to glean this unobservable rate is critical to setting Fed interest-rate policy. Nick Timiraos, WSJ, "New York Fed Eyes John Williams as Its Next Leader," 25 Mar. 2018 Zwicky had concluded that some type of massive, unobservable substance was lending gravitational heft to the cluster and helping to keep the thing intact. Nadia Drake, National Geographic, "Vera Rubin, Pioneering Astronomer, Dies at 88," 27 Dec. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unobservable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unobservable

1615, in the meaning defined above

Keep scrolling for more

Learn More about unobservable

Share unobservable

Statistics for unobservable

Look-up Popularity

Time Traveler for unobservable

The first known use of unobservable was in 1615

See more words from the same year

Comments on unobservable

What made you want to look up unobservable? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

by force of circumstances

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!