in·​sta·​ble | \ (ˌ)in-ˈstā-bəl How to pronounce instable (audio) \

Definition of instable

Examples of instable in a Sentence

Recent Examples on the Web Photo: agencja gazeta/Reuters Some commentators compared the murder to the killing of Jo Cox, a British liberal legislator who was shot and stabbed to death by a mentally instable man inspired by far-right politics. Bojan Pancevski, WSJ, "Polish Politician Dies After Stabbing, Sparking Uproar," 14 Jan. 2019 With today's instable geopolitical times, a theatrical reboot offers fresh fodder for the show to put a mirror up to society. Ben Panko, Smithsonian, "‘Twilight Zone’ Enters the Stage Dimension," 19 July 2017

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

First Known Use of instable

15th century, in the meaning defined above

History and Etymology for instable

Middle English, from Middle French or Latin; Middle French, from Latin instabilis, from in- + stabilis stable

Keep scrolling for more

Learn More about instable

Time Traveler for instable

Time Traveler

The first known use of instable was in the 15th century

See more words from the same century

Statistics for instable

Cite this Entry

“Instable.” Dictionary, Merriam-Webster, Accessed 27 Jan. 2021.

Comments on instable

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


Test Your Vocabulary

Slippery Words Quiz—Changing with the Times

  • ducreux self portrait yawning
  • What is an earlier meaning of nice?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!


Anagram puzzles meet word search.

Love words? Need even more definitions?

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