fientive
designating a durative and dynamic action performed by the subject
This underlines again that a contrast of nominality versus verbality conveys a stative versus fientive purport.
designating entering into a state as opposed to being in a state
The basic idea is that what previous scholarship categorised as a stative, viz. the various forms going back to a derivation with a long ē, is in fact a fientive, i.e. it designates the becoming and not the being.
Where it comes from
From Latin fīēns (“becoming; happening”, present active participle of fīō (“to become; to happen”)), on the pattern of words such as stative, durative, iterative, causative etc.
Adapted from the Wiktionary entry fientive (CC BY-SA 4.0).