-ivus

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.u̯us/, [ˈiːu̯ʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈi.vus/, [ˈiːvus]

-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”

   agō → āctus → āctīvus

   stō → status → statīvus

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

   cadō → cadīvus

   noceō → nocīvus

   Less frequently added to a noun stem

   fēstum → fēstīvus

   fūrtum → fūrtīvus

First/second-declension adjective.

• -īvius