below in § 70, 1, all Adjectives of the Third Declension follow the
inflection of Ä­-stems; i.e. they have the Ablative Singular in -Ä«, the
Genitive Plural in -ium, the Accusative Plural in -īs (as well as -ēs) in
the Masculine and Feminine, and the Nominative and Accusative Plural in
-ia in Neuters.

Adjectives of Three Terminations.

68. These are declined as follows:--

Ācer, _sharp_.

SINGULAR.
MASCULINE. FEMININE. NEUTER.
_Nom._ ācer ācris ācre
_Gen._ ācris ācris ācris
_Dat._ ācrī ācrī ācrī
_Acc._ ācrem ācrem ācre
_Voc._ ācer ācris ācre
_Abl._ ācrī ācrī ācrī

PLURAL.
_Nom._ ācrēs ācrēs ācria
_Gen._ ācrium ācrium ācrium
_Dat_, ācribus ācribus ācribus
_Acc._ ācrēs, -īs ācrēs, -īs ācria
_Voc._ ācrēs ācrēs ācria
_Abl._ ācribus ācribus ācribus

1. Like ācer are declined alacer, _lively_; campester, _level_; celeber,