Uproarious means very noisy, and by extension extremely funny. Uproarious laughter, an uproarious evening, uproarious applause.
The noise came first and the humour follows from it, since what is uproarious causes an uproar. It is a warm word, so an uproarious party is a success rather than a nuisance.
1adjectiveuproariousVery noisy, and extremely funny.
“The last act was uproarious and the curtain came down on applause.”
uproarious is a quality.
Uproar plus -ious; uproar is from Dutch oproer, a stirring up, reshaped in English by the sound of roar.
German
Aufruhr
Dutch
oproer
English
uproar
English, today
uproarious
From uproar + ious (a variant of -ous (“suffix forming adjectives from nouns, to denote possession or presence of a quality in any degree, commonly in abundance”)). uproar Dutch oproer or German Aufruhr, as up + roar.
Etymology from Wiktionary, CC BY-SA