[*] 122. The following special points require notice:— [*] a. Several adjectives vary in declension: as, gracilis (-us), hilaris (-us), inermis (-us), bicolor (-ōrus). [*] b. A few adjectives are indeclinable: as, damnās , frūgī (really a dative of service, see § 382. 1. N. 2), nēquam (originally an adverb), necesse , and the pronominal forms tot , quot , aliquot, totidem . Potis is often used as an indeclinable adjective, but sometimes has pote in the neuter. [*] c. Several adjectives are defective: as, exspēs (only nom.), exlēx ( exlēgem ) (only nom. and acc. sing.), pernox ( pernocte ) (only nom. and abl. sing.); and prīmōris , sēminecī , etc., which lack the nominative singular. [*] d. Many adjectives, from their signification, can be used only in the masculine and feminine. These may be called adjectives of common gender. Such are adulēscēns, youthful; [†dēses], -idis, slothful; inops , -opis, poor; sōspes , -itis, safe. Similarly, senex, old man, and iuvenis, young man, are sometimes called masculine adjectives. For Adjectives used as Nouns, see §§ 288, 289; for Nouns used as Adjectives, see § 321. c; for Adjectives used as Adverbs, see § 214; for Adverbs used as Adjectives, see § 321. d.
[*] 122. The following special points require notice:— [*] a. Several adjectives vary in declension: as, gracilis (-us), hilaris (-us), inermis (-us), bicolor (-ōrus). [*] b. A few adjectives are indeclinable: as, damnās , frūgī (really a dative of service, see § 382. 1. N. 2), nēquam (originally an adverb), necesse , and the pronominal forms tot , quot , aliquot, totidem . Potis is often used as an indeclinable adjective, but sometimes has pote in the neuter. [*] c. Several adjectives are defective: as, exspēs (only nom.), exlēx ( exlēgem ) (only nom. and acc. sing.), pernox ( pernocte ) (only nom. and abl. sing.); and prīmōris , sēminecī , etc., which lack the nominative singular. [*] d. Many adjectives, from their signification, can be used only in the masculine and feminine. These may be called adjectives of common gender. Such are adulēscēns, youthful; [†dēses], -idis, slothful; inops , -opis, poor; sōspes , -itis, safe. Similarly, senex, old man, and iuvenis, young man, are sometimes called masculine adjectives. For Adjectives used as Nouns, see §§ 288, 289; for Nouns used as Adjectives, see § 321. c; for Adjectives used as Adverbs, see § 214; for Adverbs used as Adjectives, see § 321. d.