variant of -ous, added to stems of Latin origin, often with corresponding nouns ending in -ity:, atrocious; hilarious.
Compare -eous.

Middle EnglishLatin -iōsus (see -i-, -ose1) and Latin -ius (masculine singular adj. ending, as in varius)

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World English Dictionary
suffix forming adjectives
Compare -eous characterized by or full of: ambitious; religious; suspicious
[from Latin -ius and -iōsus full of]

Collins English Dictionary - Complete & Unabridged 10th Edition
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