Devout (5)
'devout' is the definition.
(devoutly religious)
This is all the clue.
(Other definitions for pious that I've seen before include "Good" , "Holier-than-thou" , "Dutiful" , "Self-righteous" , "Sanctimonious" .)
(Other definitions for godly that I've seen before include "Religious, pious" , "Reverential" , "Pious, decent" , "Divine" , "Devout" .)