Definition of futile in the Definitions.net dictionary. Meaning of futile . What does futile mean ? Information and translations of futile in the most comprehensive dictionary definitions resource on the web. The meaning of FUTILE is serving no useful purpose : completely ineffective. How to use futile in a sentence. Did you know? Synonym Discussion of Futile . Futile means having no effect or achieving nothing. Learn how to use this adjective in different contexts, see synonyms and related words, and explore examples from the Cambridge English Corpus. Master the word " FUTILE " in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.