Vague

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mid 16th century: from French, or from Latin vagus ‘wandering, uncertain’.

wiktionary

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From Middle French vague, from Latin vagus(“uncertain, vague”, literally “wandering, rambling, strolling”).

etymonline

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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.