unsuccessful
Americanadjective
adjective
Other Word Forms
Etymology
Origin of unsuccessful
First recorded in 1610–20; un- 1 + successful
Explanation
When something is unsuccessful, it means it didn’t quite work out as planned, like trying to bake a towering, multilayered cake and ending up with a pancake instead. The word unsuccessful comes from the Latin roots un- meaning "not" and successus, meaning "a good outcome." It describes an attempt that doesn’t achieve its intended result. For example, an unsuccessful attempt at gardening will result in wilted plants rather than beautiful blooms. Although being unsuccessful can be frustrating, it’s also a valuable part of learning and growing. Many great inventors and artists faced unsuccessful attempts before finally succeeding.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The midfielder attempted to re-ignite his career but endured unsuccessful spells at West Ham and Ipswich over the next two seasons.
From BBC ● Jul. 30, 2026
Shortly after, Sheinbaum announced that Mexico’s navy had been deployed from Acapulco in the ultimately unsuccessful search for a survivor.
From Los Angeles Times ● Jul. 20, 2026
The question became widely known during the 1980s after physicist Richard Feynman described his own unsuccessful attempts to investigate it experimentally.
From Science Daily ● Jul. 17, 2026
They could also address an unsuccessful attempt by Donaldson's lawyers to have his trial separated from the trial of the facts of his wife, Eleanor Donaldson.
From BBC ● Jul. 17, 2026
Fudge attempted to smile, but was unsuccessful; he merely looked as though he had a toothache.
From "Harry Potter and the Half-Blood Prince" by J.K. Rowling
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
