elusive, evasive - skillful at eluding capture; "a cabal of conspirators, each more elusive than the archterrorist"- David Kline Antonym:artless (indirect, via artful)
elusive, subtle - be difficult to detect or grasp by the mind; "his whole attitude had undergone a subtle change"; "a subtle difference"; "that elusive thing the soul" Antonyms:palpable, tangible (indirect, via impalpable)