elusory

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.

adjective

1. avoiding the issue; evasiveelusory arguments
2. difficult to grasp mentally; elusiveelusory ideas

adjective

1. difficult to catchan elusive thief
2. preferring or living in solitude and anonymity
3. difficult to rememberan elusive thought