First-Second Declension
| Singular | Masculine | Feminine | Neuter |
| Nominative | novus | nova | novum |
| Vocative | nove | nova | novum |
| Genitive | novī | novae | novō |
| Dative | novō | novae | novō |
| Accusative | novum | novam | novum |
| Ablative | novō | novā | novō |
| Plural | Masculine | Feminine | Neuter |
| Nom/Voc | novī | novae | nova |
| Genitive | novōrum | novārum | novōrum |
| Dative | novīs | novīs | novīs |
| Accusative | novōs | novās | nova |
| Ablative | novīs | novīs | novīs |
Third Declension
| Singular | Masc/Fem | Neuter | Masculine | Feminine | Neuter |
| Nom/Voc | omnis | omne | acer | acris | acre |
| Genitive | omnis | omnis | acris | acris | acris |
| Dative | omnī | omnī | acrī | acrī | acrī |
| Accusative | omnem | omne | acrem | acrem | acre |
| Ablative | omnī | omnī | acrī | acrī | acrī |
| Plural | Masc/Fem | Neuter | Masculine | Feminine | Neuter |
| Nom/Voc | omnēs | omnia | acrēs | acrēs | acria |
| Genitive | omnium | omnium | acrium | acrium | acrium |
| Dative | omnibus | omnibus | acribus | acribus | acribus |
| Accusative | omnēs(-īs) | omnia | acrēs(-īs) | acrēs(-īs) | acria |
| Ablative | omnibus | omnibus | acribus | acribus | acribus |
One-Ending Third Declension Adjectives
| Singular | Masc/Fem | Neuter |
| Nom/Voc | tacēns | tacēns |
| Genitive | tacentis | tacentis |
| Dative | tacentī | tacentī |
| Accusative | tacentem | tacēns |
| Ablative | tacentī(-e)* | tacentī(-e)* |
| Plural | Masc/Fem | Neuter |
| Nom/Voc | tacentēs | tacentia |
| Genitive | tacentium | tacentium |
| Dative | tacentibus | tacentibus |
| Accusative | tacentēs(-īs) | tacentia |
| Ablative | tacentibus | tacentibus |
*The present participle, when used as a non-finite verb (e.g., in an ablative absolute), ends in –e in the ablative.
Comparison of Adjectives
Regular
| Positive | Comparative | Superlative |
| fortis, -is, -e | fortior, fortius | fortissimus, -a, -um |
| pūrus, -a, -um | pūrior, purius | pūrissimus, -a, -um |
| celer, celeris, celere | celerior, celerius | celerrimus, -a, -um |
| pulcher, pulchra, pulchrum | pulchrior, pulchrius | pulcherrimus, -a, -um |
Six adjectives in -lis (facilis, difficilis, similis, dissimilis, gracilis, humilis) are compared facilis, facilior, facillimus. All the other adjectives in -lis, e.g., crūdēlis, nōbilis, etc., have the -issimus superlative.
Irregular
| Positive | Comparative | Superlative |
| bonus, -a, -um | melior, melius | optimus, -a, -um |
| magnus, -a, -um | maior, maius | maximus, -a, -um |
| malus, -a, -um | peior, peius | pessimus, -a, -um |
| multus, -a, -um | plūs*; plūrēs, plūra | plurimus, -a, -um |
| parvus, -a, -um | minor, minus | minimus, -a, -um |
| —(prae, prō: prep.) | prior, prius | prīmus, -a, -um |
| —(prope: prep.) | propior, propius | proximus, -a, -um |
| —(ultrā: prep.) | ulterior, ulterius | ultimus, -a, -um |
*Plūs is a neuter singular noun, not an adjective.
Paradigm of the Comparative Adjective
| Singular | Masc/Fem | Neuter |
| Nominative | fortior | fortius |
| Genitive | fortiōris | fortiōris |
| Dative | fortiōrī | fortiōrī |
| Accusative | fortiōrem | fortius |
| Ablative | fortiōre | fortiōre |
| Plural | Masc/Fem | Neuter |
| Nominative | fortiōrēs | fortiōra |
| Genitive | fortiōrum | fortiōrum |
| Dative | fortiōribus | fortiōribus |
| Accusative | fortiōrēs | fortiōra |
| Ablative | fortiōribus | fortiōribus |
Formation of Adverbs from Adjectives
Adverbs are regularly formed from adjectives by the morphemes {ē} or {ter}.
ē is used if the adjective is first and second declension: honestē from honestus a um
ter is used if the adjective is third declension: fortiter from fortis forte
The comparative adverb is the accusative singular neuter of the comparative adjective: honestius
The superlative adverb is regularly formed with the –ē morpheme: honestissimē