pĕr-invītus, a, um, adj.,
very unwilling : ne perinvitus legerem tuas litteras, Cic. Fam. 7, 33, 2 (dub.); Liv. 40, 57, 3.
per-invītus adj., very unwilling, with great reluctance: litteras legi perinvitus. ...
An Elementary Latin Dictionary