per-grātus — Lewis & Short
per-grātus, a, um, adj.,
litterae,Cic. Q. Fr. 3, 1, 6, § 23:
id mihi pergratum perque jucundum erit,id. ib. 3, 1, 4, § 12; id. Att. 10, 4, 1:
pergratum mihi feceris, si,you would do me a great pleasure, a great favor, id. Lael. 4, 16.—In tmesi:
per mihi, per, inquam, gratum feceris, si, etc.,Cic. Att. 1, 20, 7.