Ranked by relevance and common usage.
Keep "vapourous" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
If two options seem close, choose the one that best matches the audience and purpose of the sentence.
Choose a synonym only if it keeps the core idea of "vapourous" intact in the sentence you are editing.
Check whether the replacement sounds more formal, casual, emotional, technical, or forceful than the original word.
Read the full sentence after the swap. Keep the synonym only when the sentence becomes clearer or more precise.
Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "vapourous", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
If the synonym makes the sentence slower, vaguer, or more dramatic than intended, keep "vapourous" or choose a simpler alternative from the closest-match group.
OpenGloss and ConceptNet supply richer edges like generalizations, collocations, and derivations.
4 total sentences available.
[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 ^([sic]).
Source: wiktionary
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.
Source: wiktionary
The boundless, overflowing, bursting gladness, / The vapourous exultation not to be confined!
Source: wiktionary
The wind began to rise and soon the vapourous mist began to eddy and whirl in wild confusion.
Source: wiktionary
Closest matches include vaporous, cobwebby, diaphanous, ethereal, filmy.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.