Etymology
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vague (adj.)

"uncertain as to specifics," 1540s, from French vague "empty, vacant; wild, uncultivated; wandering" (13c.), from Latin vagus "strolling, wandering, rambling," figuratively "vacillating, uncertain," perhaps from PIE *Huog-o-  and cognate with Old Norse vakka "to stray, hover," Old High German wankon "to totter, stagger," Old High German winkan "to waver, stagger, wink," Old English wincian "to nod" [de Vaan]. Related: Vagueness.

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Definitions of vague

vague (adj.)
not clearly expressed or understood; "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;
Synonyms: obscure
vague (adj.)
not precisely limited, determined, or distinguished;
vague feelings of sadness
a vague uneasiness
Synonyms: undefined
vague (adj.)
lacking clarity or distinctness;
saw a vague outline of a building through the fog
Synonyms: dim / faint / shadowy / wispy
From wordnet.princeton.edu