vĕnēnōsus — Lewis & Short
vĕnēnōsus, a, um, adj.id.,
I full of poison, very poisonous:
herba,Aug. Gen. ad Lit. 8, 13.—Adv.: vĕnēnōsē, very poisonously, Cassiod. Hist. Eccl. 6, 25.