WEIRD - Synonyms, related words and examples | Cambridge English Thesaurus Weird definition: strange; odd; bizarre.. See examples of WEIRD used in a sentence. Definition of weird adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. WEIRD meaning: 1. very strange and unusual, unexpected, or not natural: 2. very strange and unusual, unexpected…. Learn more.