3 days ago · The meaning of UNCONVENTIONAL is not conventional : not bound by or in accordance with convention : being out of the ordinary. How to use unconventional in a sentence. different from what is usual or from the way most people do things: 2. different from what is…. Definition of unconventional adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. If you describe a person or their attitude or behavior as unconventional, you mean that they do not behave in the same way as most other people in their society. To be unconventional is to act, dress, speak, or otherwise exist out of the bounds of cultural norms. If you eat cheeseburgers for breakfast, that's somewhat unconventional. unconventional [ˈʌnkənˈvenʃənl] ADJ → poco convencional; [person] → original, poco convencional WordReference Random House Unabridged Dictionary of American English © 2026 un•con•ven•tion•al (un′kən ven′ shə nl), adj. not conventional; not bound by or conforming to convention, rule, or ….