illiberal (adj.)

1530s, "ungentlemanly, base, mean," from Middle French illiberal (14c.), from Latin illiberalis "ungenerous, mean, sordid; unworthy of a freeman; stingy, disobliging," from assimilated form of in- "not, opposite of" (see in- (1)) + liberalis (see liberal (adj.)). A sense of "narrow-minded politically; unconcerned with the rights or liberties of others" is attested from 1640s (as a noun in this sense 1818), and might be revived to ease the load of meanings that weighs on conservative.