pĕr-attentus — Lewis & Short
pĕr-attentus, a, um, adj.,
I very attentive:
animus,Cic. Verr. 2, 3, 5, § 10.—Adv.: pĕrattentē, very attentively:
audire aliquem,Cic. Cael. 11, 25.