-acious

aff. a suffix used in English adaptations of Latin adjectives ending in -ax:

audacious; mendacious; tenacious

Compare -ous Etymology: < L -āci-, s. of -āx deverbal adj. suffix (usu. with the sense “tending to perform, characterized by” the action of the verb) + -ous

From formal English to slang. 2014.

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