From the Proto-Indo-European *-iHwós, an extended form of *-wós. Cognate with Ancient Greek -εῖος (-eîos) (whence also some Latin forms in -ēus).

• (Classical Latin) IPA^(key): [ˈiː.wʊs]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈiː.vus]

-īvus (feminine -īva, neuter -īvum); first/second-declension suffix

1. Adjective suffix.

   Added to the perfect passive participial stem of verbs, forming a deverbal adjective meaning “doing” or “related to doing”

   ‎āctus + ‎-ivus → ‎āctīvus

   ‎status + ‎-ivus → ‎statīvus

   Less frequently, added to the root or present stem of a verb

   ‎cadō + ‎-ivus → ‎cadīvus

   ‎noceō + ‎-ivus → ‎nocīvus

   Less frequently added to a noun stem

   ‎fēstum + ‎-ivus → ‎fēstīvus

   ‎fūrtum + ‎-ivus → ‎fūrtīvus

First/second-declension adjective.

• -īvius