causificor

causĭfĭcor, āri, v. n. [causa-facio], to allege a cause, to make a pretext or pretence, to pretend (very rare):

haut causificor quin eam Ego habeam,

I offer no pretext against keeping her, Plaut. Aul. 4, 10, 25:

blaterans atque causificans,

App. M. 10, p. 242.