elusive

elusive adjective abstruse, apt to flee, baffling, difficult to catch, difficult to comprehend, difficult to understand, eluding clear perception, elusory, enigmatic, equivocal, evanescent, evasive, fleeting, fugitive, hard to define, hard to express, hard to grasp, hard to maintain, hard to understand, impalpable, intangible, liable to disappear, mysterious, nebulous, obscure, occult, puzzling, runaway, shadowy, shunning, slippery, tending to elude, tending to escape, tending to slip away, uncertain, unclear, vanishing

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See also: delusive, ephemeral, evasive, inaccessible, oblique, recondite, stealthy, temporary, transient, unresponsive, volatile