Definition of "vapourous"

[W]e ſee that the very aire it ſelfe is never conglaciate nor frozen, nor hardened, conſidering that miſts, fogs and clouds are no congealations, but onely gatherings and thickenings of a moiſt and vapourous aire: for the true aire indeed vvhich hath no vapour at all and is altogether drie, admitteth no ſuch refrigeration as may alter it to that degree and heigth.

1603, Plutarch, “Of the Primitive or First Colde”, in Philemon Holland, transl., The Philosophie, Commonlie Called, The Morals […], London: […] Arnold Hatfield, page 998

So vvhoſoeuer ſhall entertaine high and vapourous imaginations, in ſteede of a laborious and ſober inquiry of truth ſhall beget hopes and Beliefes of ſtrange and impoſſible ſhapes.

1605, Francis Bacon, “The Second Booke”, in The Twoo Bookes of Francis Bacon. Of the Proficience and Aduancement of Learning, Diuine and Humane, London: […] [Thomas Purfoot and Thomas Creede] for Henrie Tomes, […], folio 32, verso

The boundless, overflowing, bursting gladness, / The vapourous exultation not to be confined!

1818–1819 (date written), Percy Bysshe Shelley, “Prometheus Unbound”, in Prometheus Unbound […], London: C[harles] and J[ames] Ollier […], published 1820, Act IV, scene i, page 139

The wind began to rise and soon the vapourous mist began to eddy and whirl in wild confusion.

1894, Ivan Dexter, “Talmud: A Strange Narrative of Central Australia. Founded on Natural Facts. Chapter XIV. A Mountain Tragedy.”, in Port Adelaide News and Lefevre’s Peninsula Advertiser, Adelaide, S.A.: Port Adelaide Newspaper and Printing Company; republished as Talmud: A Strange Narrative of Central Australia (eBook no. 1600641.html), Australia: Project Gutenberg Australia, May 2016