Lewis Short
(adjective) : imprŏfessus (inpr-), a, um, 2. in-professus.
* M i d., that has not professed or declared himself (post-Aug.): deferebantur, qui vel improfessi Judaicam intra Urbem viverent vitam,Suet. Dom. 12: servus,Dig. 34, 4, 16.—*
* Pass., that is not professed or declared, Quint. Decl. 341 in lemm.
Charlton T. Lewis, Charles Short, A Latin Dictionary