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See more synonyms for -tious on Thesaurus.com
  1. a suffix originally occurring in adjectives borrowed from Latin (fictitious); on this model, used with stems of other origin (bumptious).
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Also -ious, -ous.

Origin of -tious

< Latin -tiōsus, equivalent to -t(us) past participle suffix + -iōsus -ious
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018