Lewis & Short

ap-prīmus (better adp-), a, um, adj. (ad intens.), the very first; only once in Liv. Andron.: Ibidemque vir summus adprimus Patroclus, Gell. 6, 7, 11.
Hence, ap-prīmē (adp-), adv., first of all, before all, especially, exceedingly, very (most freq. in ante- and post-class. per.; in the class. per. only in Nep. Att. 13, 4; for in Cic. Fin. 3, 9, 32, the reading should be a primo; v. Madv. ad h. l.; syn.: in primis, praecipue, ante omnia); with adjj. and verbs.

  1. A. With adjj.: adprime nobilis, Plaut. Cist. 1, 2, 6; so Ter. Eun. 5, 4, 30: adprime probus, Plaut. Rud. 3, 4, 30: adprime probo (genere), id. Trin. 2, 2, 92: utile, Ter. And. 1, 1, 34: obsequens, id. Hec. 2, 2, 5 (vehementissime, Don.): adprime doctus, Varr. R. R. 3, 2, 17: adprime boni, * Nep. Att. 13, 3.
    Once with the sup.: adprime summo genere gnatus, Quadrig. ap. Gell. 7, 11, 7.
  2. B. With verbs (post-class.): adprime potuit obtingere Socrati, App. de Deo Socr. fin.; so id. Flor. 3 (in Verg. G. 2, 134, the reading of Servius and Arus. Mess. p. 214 Lind. is: flos apprima tenax; apprima being here used as adv., like acerba, acuta al.; for which, however, the best MSS. and editt. have ad prima; v. Wagn. and Rib. ad h. l.).