IPA: /dɪˈvaʊtli/
KK: /dɪˈvaʊtli/
In a way that shows deep religious feeling or commitment.
She prayed devoutly every morning before breakfast.
Devoutly → It is formed from "devotus" (from Latin, meaning devoted or dedicated) and the adverbial suffix "-ly" (meaning in a manner of). The word "devoutly" means in a manner that shows deep religious commitment or dedication.
Think of being 'dedicated' ('devotus') to something in a specific way ('-ly') — that's why devoutly means showing deep commitment.