Source : Webster's Revised Unabridged Dictionary (1913)

Vague \Vague\, n. [Cf. F. vague.]
   An indefinite expanse. [R.]

         The gray vague of unsympathizing sea.    --Lowell.

Vague \Vague\, v. i. [F. vaguer, L. vagari, fr. vagus roaming.]
   To wander; to roam; to stray. [Obs.] ``[The soul] doth vague
   and wander.'' --Holland.

Vague \Vague\, n.
   A wandering; a vagary. [Obs.] --Holinshed.

Vague \Vague\ (v[=a]g), a. [Compar. {Vaguer} (v[=a]g"[~e]r);
   superl. {Vaguest}.] [F. vague, or L. vagus. See {Vague}, v.
   i.]
   1. Wandering; vagrant; vagabond. [Archaic] ``To set upon the
      vague villains.'' --Hayward.

            She danced along with vague, regardless eyes.
                                                  --Keats.

   2. Unsettled; unfixed; undetermined; indefinite; ambiguous;
      as, a vague idea; a vague proposition.

            This faith is neither a mere fantasy of future
            glory, nor a vague ebullition of feeling. --I.
                                                  Taylor.

            The poet turned away, and gave himself up to a sort
            of vague revery, which he called thought.
                                                  --Hawthorne.

   3. Proceeding from no known authority; unauthenticated;
      uncertain; flying; as, a vague report.

            Some legend strange and vague.        --Longfellow.

   {Vague year}. See {Sothiac year}, under {Sothiac}.

   Syn: Unsettled; indefinite; unfixed; ill-defined; ambiguous;
        hazy; loose; lax; uncertain.

Source : WordNet®

vague
     adj 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;
            "their descriptions of human behavior become vague,
            dull, and unclear"- P.A.Sorokin; "vague...forms of
            speech...have so long passed for mysteries of
            science"- John Locke [syn: {obscure}]
     2: not precisely limited, determined, or distinguished; "an
        undefined term"; "undefined authority"; "some undefined
        sense of excitement"; "vague feelings of sadness"; "a
        vague uneasiness" [syn: {undefined}] [ant: {defined}]
     3: lacking clarity or distinctness; "a dim figure in the
        distance"; "only a faint recollection"; "shadowy figures
        in the gloom"; "saw a vague outline of a building through
        the fog"; "a few wispy memories of childhood" [syn: {dim},
         {faint}, {shadowy}, {wispy}]