2. Adjectives of two terminations.
3. Adjectives of one termination.
a. With the exception of Comparatives, and a few other words mentioned below in [§ 70], 1, all Adjectives of the Third Declension follow the inflection of ĭ-stems; i.e. they have the Ablative Singular in -ī, 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, famous; equester, equestrian; palūster, marshy; pedester, pedestrian; puter, rotten; salūber, wholesome; silvester, woody; terrester, terrestrial; volucer, winged; also names of months in -ber, as September.
2. Celer, celeris, celere, swift, retains the e before r, but lacks the Genitive Plural.
3. In the Nominative Singular of Adjectives of this class the Feminine form is sometimes used for the Masculine. This is regularly true of salūbris, silvestris, and terrestris. In case of the other words in the list, the use of the Feminine for the Masculine is confined chiefly to early and late Latin, and to poetry.