de·vout 
(dĭ-vout)
(dĭ-vout)adj. de·vout·er, de·vout·est
1.
a. Devoted to a religion or to the fulfillment of religious obligations: a devout Catholic.
b. Characterized by religious devotion or piety: devout observance of the holy days.
2.
a. Fervently believing in or advocating an ideology or position: a devout socialist.
b. Fervent or earnest: devout wishes for their success.
[Middle English, from Old French, from Latin dēvōtus, past participle of dēvovēre, to vow; see DEVOTE.]
de·voutly adv.
de·voutness n.