What does unstable mean

Click on the arrows to change the translation direction. Follow us. Choose a dictionary. Clear explanations of natural written and spoken English. Usage explanations of natural written and spoken English. Grammar Thesaurus. Word Lists. Choose your language. My word lists. Tell us about this example sentence:. The word in the example sentence does not match the entry word. Dictionary entry overview: What does unstable mean? This is the first unstable radioactive molecule definitively detected outside of the Solar System.

All his weight was on one foot, and he was in a state of unstable equilibrium. Epipropidone is not used clinically due to its unstable nature. A white, crystalline powder that is very unstable in the presence of light but fairly heat resistant.

This unstable electron configuration causes these chemicals to be highly reactive with other molecules. If by any chance you spot an inappropriate image within your search results please use this form to let us know, and we'll take care of it shortly.

Term » Definition. Word in Definition. Princeton's WordNet 0. Wiktionary 0. Webster Dictionary 0. Freebase 0. Chambers 20th Century Dictionary 5. Anagrams for Unstable » abluents. How to pronounce Unstable? Alex US English. David US English. Mark US English. Daniel British. Libby British.

Mia British. Karen Australian. See word origin. The definition of unstable is something that is prone to changing often, or a person with wild mood swings. Not firmly placed; unsteady. Liable to undergo spontaneous decay into some other form. For example, the nucleus of uranium atom is unstable and changes by radioactive decay into the nucleus of thorium , a lighter element.

Many subatomic particles, such as muons and neutrons, are unstable and decay quickly into other particles.