Lewis & Short

perrīdĭcŭlē, adv., v. perridiculus fin.

per-rīdĭcŭlus, a, um, adj., very laughable, very ridiculous: doctrina, Cic. de Or. 2, 19, 77; Val. Max. 9, 12, 8.
Adv.: perrī-dĭcŭlē, very laughably, very ridiculously, Cic. de Or. 2, 59, 239: perridicule homines augurabantur, id. Verr. 2, 2, 6, § 18 Zumpt, N. cr.