Adjective
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making great mental demands
hard to comprehend or solve or believe
"a baffling problem"
"I faced the knotty problem of what to have for breakfast"
"a problematic situation at home"
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difficult to detect or grasp by the mind or analyze
"his whole attitude had undergone a subtle change"
"a subtle difference"
"that elusive thing the soul"
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skillful at eluding capture
"a cabal of conspirators, each more elusive than the archterrorist"- David Kline
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difficult to describe
"a haunting elusive odor"