In Italian some adjectives preserve in the superlative absolute form the Latin ending -errimo.
Let’s have a look at them:
- acre / acrid —> absolute superlative acerrimo
- celebre / renowned —> absolute superlative celeberrimo
- integro / intact —> absolute superlative integerrimo
- misero / miserable —> absolute superlative miserrimo
- salubre / salubrious —> absolute superlative saluberrimo
- aspro / sour —> absolute superlative asperrimo
- tetro / sullen —> absolute superlative teterrimo
Note that it is common nowadays to find acerrimo improperly used as an adjective in its positive degree, synonymous of feroce / fierce. This means that it often recurs in the comparative degree or in the relative superlative form (preceded by the adverb più).
For example:
Fu il suo più acerrimo nemico. (He was his most fierce enemy.)
