The meaning of USEFUL is capable of being put to use; especially : serviceable for an end or purpose. How to use useful in a sentence.

USEFUL definition: 1. effective; helping you to do or achieve something: 2. the time during which something or…. Learn more.

A useful idiot or useful fool is a pejorative description of a person, suggesting that the person thinks they are fighting for a cause without fully comprehending the consequences of their …

1. being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society. 2. of practical use; producing material results; supplying common …

WordReference Random House Unabridged Dictionary of American English © 2025 use•ful (yo̅o̅s′ fəl), adj. being of use or service; serving some purpose; advantageous, helpful, or of good …

Dec 14, 2025 · useful (comparative more useful or usefuller, superlative most useful or usefullest) That’s a very useful tool for gardeners. She found the information extremely useful.

Definition of useful adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

useful, adj. & n. meanings, etymology, pronunciation and more in the Oxford English Dictionary

If something is useful, you can use it to do something or to help you in some way.

The lessons learned from that experience can be usefully applied to the current situation. She kept herself usefully employed. He questioned the usefulness of such a device.