1/2dc adjectives add ē to the stem.
3dc adjectives add ter to the stem, but removing duplicate t
prudens, prudentis → prudent-ter → prudenter
fortis, forte → fortiter (note the stem is forti because all 3dc adjectives are i-stem! (except 1-termination))
some 1/2dc adjectives have an additional -iter ending
durē, duriter
also used as adverb:
- NT acc SG of adj
- why accusative instead of nominative?
- NT abl SG
- FM abl SG
also a bunch of other ways to form adverbs and also adverbs that don't come from adjectives, like nōn