-acious

suffix

Used to form adjectives from nouns and verb stems.

“sage → sagacious”

OriginProto-Indo-European *h₃édosder.? →
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Meanings

suffix
  1. Used to form adjectives from nouns and verb stems.

    sage → sagacious

    2 more examples

    audacity → audacious

    fallacy → fallacious

Origin

  1. Proto-Indo-European*h₃ed-
  2. Proto-Indo-European*h₃édosder.?
  3. English-acious

From (1) -aci(ty) + -ous and (2) from Old French -acieux, both ultimately from Latin -ācitās.

More words from Old French, Latin

Full word history & related roots →

Translations

Spanish -az
  • -azadjective-forming suffix
Cite this entry
APA

-acious. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/-acious

MLA

“-acious.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/-acious. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “-acious,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/-acious.

Source: -acious on Wiktionary, CC BY-SA 4.0.