-eous

• (General American) enPR: -ēəs, IPA^(key): /-i.əs/
• (Received Pronunciation) enPR: -ĭəs, IPA^(key): /-ɪəs/

From earlier -uous, alteration of -wose, -wos, a variant of -wise, from Middle English -wise, -wis, -wys, from Old English -wīs (“-wise”). More at -wise.

-eous

1. Used with nouns to form adjectives with the sense of resembling to or having the characteristics of the suffixed term; similar to -ous.

   righteous, mighteous, thefteous, lighteous, misteous, timeous, wrongeous

Chiefly from -ous with preceding vowel (compare -ious); compare also Latin -eus; but also by concatenation with English -te (an earlier form of -ty).

-eous

1. Used to form adjectives meaning resembling or having characteristics of the related term.

• -aceous
• -aneous
• -ious
• -uous

• Ouse, ouse