vague

adjective

1. 1

   not clearly understood or expressed

   an obscure turn of phrase

   an impulse to go off and fight certain obscure battles of his own spirit"-Anatole Broyard

2. 2

   not precisely limited, determined, or distinguished

   an undefined term

   undefined authority

3. 3

   lacking clarity or distinctness

   a dim figure in the distance

   only a faint recollection