According to the Oxf Ps1 edition, the word, only occurring in Paris, BN, Lat. 768, seems to have retained its Latin -a ending there. Short’s newer edition, Oxf Psants, does not provide any variant reading for this line.
a.
1morally corrupt, depraved:
(
s.xii1; MS: c.1145
)
Que il ne seient fait sicume li peres d’els, generaciuns felunesse e enasprissante (var. (P: s.xii4/4) generatiun prava)105.LXXVII.10 (var.)
[prave] (s.xii4/4)