ETYMOLOGY
partly from Anglo-Norman ragous (raging), from rage (rage) + -ous,
and partly directly from rage (n.) + -ous
EXAMPLE (for adj. 1)
“…What nede y spende more enke or parchement,
That fele the crampe of deth myn hert so nyghe
As thorugh this rageous fyre which hath me hent?
Thus calle y for yowre socoure pitously…”
From: The English Poems of Charles of Orleans
Edited by R. Steele, 1941
Fortunes Stabilnes, c1450
Lexicophilia 