1st & 2nd declension adjectives Novus, nova, novum (usually rendered novus -a -um): new Singular Plural masculine feminine neuter masculine feminine neuter Nominative novus nova novum novi novae nova Genitive novi novae novi novorum novarum novorum Dative novo novae novo novis novis novis Accusative novum novam novum novos novas nova Ablative novo nova novo novis novis novis Helpful note: Since adjectives have gender just like nouns, an adjective roaming around loose with no noun attached is understood to mean "<blank> man/men" "<blank> woman/women" or "<blank> thing/things", e.g. novi "new men" (a favorite of Roman politicians looking to disparage recent acquirers of Senatorial status), mala "bad things" or "bad woman" (depending on context), etc. (Et cetera, incidentally, means literally, "and other things.") 3rd declension adjectives 3 terminations: Singular Plural masculine feminine neuter masculine/feminine neuter Nominative celer celeris celere celeres celeria Genitive celeris celeris celeris celerium celerium Dative celeri celeri celeri celeribus celeribus Accusative celerem celerem celere celeres celeria Ablative celeri celeri celeri celeribus celeribus 2 terminations: Singular Plural masculine/feminine neuter masculine/feminie neuter Nominative brevis breve breves brevia Genitive brevis brevis brevium brevium Dative brevi brevi brevibus brevibus Accusative brevem breve breves brevia Ablative brevi brevi brevibus brevibus 1 termination: Singular Plural masculine/feminine neuter masculine/feminine neuter Nominative audax audax audaces audacia Genitive audacis audacis audacium audacium Dative audaci audaci audacibus audacibus Accusative audacem audax audaces audacia Ablative audaci audaci audacibus audacibus As you can see, the only thing that varies by number of terminations is the nominative singular; all other forms are regular 3rd declension i-stems.