allusive vs. elusive

adjective

  1. having reference to something implied or inferred; containing, abounding in, or characterized by allusions.

  2. Obsolete.,  metaphorical; symbolic; figurative.

adjective

  1. eluding or failing to allow for or accommodate a clear perception or complete mental grasp; hard to express or define.

    an elusive concept.

  2. cleverly or skillfully evasive.

    a fish too elusive to catch.

  3. difficult to find.

    hoping that elusive donors will finally contribute.