pĕr-attentus, a, um, adj.,
very attentive : animus, Cic. Verr. 2, 3, 5, § 10.—Adv.: pĕrattentē , very attentively : audire aliquem, Cic. Cael. 11, 25.
per-attentus adj., very attentive: animi. ...
An Elementary Latin Dictionary