Tending to elude capture, perception, comprehension, or memory: "an invisible cabal of conspirators, each more elusive than the archterrorist [himself]"(David Kline).
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).
[From Latin ēlūsus, past participle of ēlūdere, to elude; see elude.] e·lu'sive·ly adv., e·lu'sive·ness n.