Vague

adj.

1. Not clearly expressed; inexplicit.
2. Not thinking or expressing oneself clearly.
3. Lacking definite shape, form, or character; indistinct: saw a vague outline of a building through the fog.
4. Not clear in meaning or application. See Synonyms at ambiguous. Indistinctly felt, perceived, understood, or recalled; hazy: a vague uneasiness