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Webster 1913 Edition

Adj.

Of or pertaining to the pope; taught or ordained by the pope; hence, of or pertaining to the Roman Catholic Church; – often used opprobriously.

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Pop′ish-ly

adv.

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Pop′ish-ness

Noun.

Adj.

Relating to the pope; taught by the pope; pertaining to the pope or to the church of Rome; as popish tenets or ceremonies.

popish

(derogatory) of or pertaining to Roman Catholicism
- Bishop Joseph Hall
  I do, therefore, much blame the petulcity of whatsoever author, that should dare to impute a Popish affection to him […]
(derogatory) acting like, or holding beliefs similar to, the pope.