Lewis & Short

incessans, antis, adj. [2. in-cessans], incessant (post-class.): virtus, Cassiod. Complex. Act. Apost. 11.
Adv.: incessan-ter, incessantly: inhaerere, Cod. Just. 11, 42, 10 fin.: legebat auctores antiquos, Sid. Ep. 8, 11 med.