Etymology
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illiberal (adj.)

1530s, "ungentlemanly, base, mean," from 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.

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narrow-minded (adj.)

also narrowminded, "bigoted, illiberal, of confined views or sentiments," 1620s, from narrow (adj.) + -minded. Related: Narrow-mindedness. Middle English had narrow-hearted "mean, ungenerous, ignoble" (c. 1200).

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