Where does “-ious” come from?

-ious (English) comes from Latin -ius, from Proto-Italic -jōs, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

-ious (English): Alternative spelling of -ous; "forming...

Definitions

  1. Alternative spelling of -ous; "forming...

Ancestry of “-ious”, step by step

StepLanguageWordMeaning
1Latin-iusforming adjectives from nouns; nominative neuter...
2Proto-Italic-jōsForms comparative adjectives
3Proto-Indo-European-yósCreates adjectives from noun or verb stems

Words derived from “-ious”

Every word from Proto-Indo-European -yós →Every word from Latin -ius →Every word from Proto-Italic -jōs →