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-ious

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

Origin of -ious

Middle EnglishLatin -iōsus (see -i-, -ose1) and Latin -ius (masculine singular adj. ending, as in varius)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -ious

-ious

suffix forming adjectives
  1. characterized by or full ofambitious; religious; suspicious Compare -eous
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Word Origin for -ious

from Latin -ius and -iōsus full of
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012