vague
adjective
not clearly expressed or understood
“an obscure turn of phrase”
“an impulse to go off and fight certain obscure battles of his own spirit”
Synonymsobscurenot precisely limited, determined, or distinguished
“an undefined term”
“undefined authority”
Synonymsundefinedlacking clarity or distinctness
“a dim figure in the distance”
“only a faint recollection”
Source: WordNet 3.1, Princeton University
