Oct 16, 2026 · 5 min · 6 segments
We've already learned about first class adjectives but there are some with irregular genitive endings. Let's get a look at these! Script by Patrizia Farina, Professor of Italian at Western…
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Adjectives that decline like bonus follow the second declension in the masculine, the first declension in the feminine, and the second declension in the neuter.
There are, however, some adjectives in Latin which are irregular in the genitive and dative singular.
They technically still belong to the first class of adjectives, but in the genitive case they end in ius for all three genders instead of the regular genitive endings.
Their plurals are completely regular, just like bonus, bona, bonum, with the exception of the adjective unus, una, unum, meaning one or alone, which obviously because of its meaning does not have any plural forms.
We are going to see the most common ones and a sample declension, plus a few others.
Adjectives that decline like bonus follow the second declension in the masculine, the first declension in the feminine, and the second declension in the neuter.
There are, however, some adjectives in Latin which are irregular in the genitive and dative singular.
They technically still belong to the first class of adjectives, but in the genitive case they end in ius for all three genders instead of the regular genitive endings.
Their plurals are completely regular, just like bonus, bona, bonum, with the exception of the adjective unus, una, unum, meaning one or alone, which obviously because of its meaning does not have any plural forms.
We are going to see the most common ones and a sample declension, plus a few others.
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