Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “ill-defined”


not clearly explained , described , or shown : When your project's goals are ill-defined, it can be impossible to plan the necessary steps to achieve those goals .
(Definition of ill-defined adjective from the Cambridge Business English Dictionary © Cambridge University Press)
Focus on the pronunciation of ill-defined

Word of the Day

prenuptial agreement

an official document signed by two people before they get married that says what will happen to their possessions and/or children if they divorce (= officially stop being married)

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More