Scrabble?! ELUSIVE

Definitions of ELUSIVE in various dictionaries:

adj - difficult to describe

adj - skillful at eluding capture

adj - difficult to detect or grasp by the mind or analyze

adj - making great mental demands

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).

adj - tending to elude