Lewis Short
(adj.adj.adv.) : ap-prŏbus (adp-), a, um, adj. ad intens.; cf. apprimus
* Very good or excellent; as an adj. once: adulescens adprobus, Caecil. ap. Gell. 7, 7, 9.—Once as adv.: ap-prŏbē: ni me ille et ego illum novissem adprobe,very well,Plaut. Trin. 4, 2, 117.
Charlton T. Lewis, Charles Short, A Latin Dictionary