Source : Webster's Revised Unabridged Dictionary (1913)

Popish \Pop"ish\, a.
   Of or pertaining to the pope; taught or ordained by the pope;
   hence, of or pertaining to the Roman Catholic Church; --
   often used opprobriously. -- {Pop"ish*ly}, adv. --
   {Pop"ish*ness}, n.

Source : WordNet®

popishly
     adv : like the Pope; in a popish manner