-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).

Pronunciation

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

Suffix

-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”

1. agō → āctus → āctīvus

   stō → status → statīvus

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

1. cadō → cadīvus

   noceō → nocīvus

1. Less frequently added to a noun stem

1. fēstum → fēstīvus

   fūrtum → fūrtīvus

Declension

First/second-declension adjective.

Number	Singular				Plural
Case / Gender	Masculine	Feminine	Neuter		Masculine	Feminine	Neuter
Nominative	-īvus	-īva	-īvum		-īvī	-īvae	-īva
Genitive	-īvī	-īvae	-īvī		-īvōrum	-īvārum	-īvōrum
Dative	-īvō		-īvō		-īvīs
Accusative	-īvum	-īvam	-īvum		-īvōs	-īvās	-īva
Ablative	-īvō	-īvā	-īvō		-īvīs
Vocative	-īve	-īva	-īvum		-īvī	-īvae	-īva