Elusive

an elusive person or animal is difficult or impossible to find or catch

1. a.

   difficult or impossible to achieve

   An agreement to end the fighting remains elusive.

    Synonyms and related words

   Difficult to do and involving a lot of effort:difficult, hard, tough…

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2. b.

   difficult to remember or understand

   elusive memories

    Synonyms and related words

   Words used to describe memory and memories:a memory like a sieve, a trip/walk down memory lane, blurred…

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    Synonyms and related words

   Complicated and difficult to understand:complicated, difficult, complex…

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