piet-, pious-

(Latin: from pius, dutiful, dutiful conduct; kind, kindness; devout; compassion)

propitiable (adjective), more propitiable, most propitiable
Able to conciliate or be more favorably inclined; able to gain the good will of; able to appease or make peace with: Lisa's baby girl seemed to be propitiable after she was given a pacifier to quiet her down.

The two families were propitiable after they found a common interest, and that was enjoying some good French wine together in the evening!

Scientia et pietas.
Knowledge and piety.

Motto of Wesleyan College, Macon, Georgia, USA.