This boson is so central to the state of physics today, so crucial to our final understanding of the structure of matter, yet so elusive, that I have given it a nickname: the God Particle. ELUSIVE definition: 1. difficult to describe, find, achieve, or remember: 2. difficult to describe, find, achieve, or…. Learn more. · Something or someone that is elusive is difficult to find, describe, remember, or achieve. In London late-night taxis are elusive and far from cheap. Definition of elusive adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. ELUSIVE definition: eluding or failing to allow for or accommodate a clear perception or complete mental grasp; hard to express or define. See examples of elusive used in a sentence. Difficult to define or describe: "Failures are more finely etched in our minds than triumphs, and success is an elusive, if not mythic, goal in our demanding society" (Hugh Drummond). In Lists: Series, Vocabulary, more... Synonyms: evasive, slippery, shifty, hard to find, hard to see, more... Collocations: is an elusive [goal, concept, quality, target], the elusive nature of, chase an elusive dream, … elusive meaning, definition, what is elusive: an elusive person or animal is difficult...: Learn more. ELUSIVE meaning: 1 : hard to find or capture; 2 : hard to understand, define, or remember