devoutly is a form of:

Devout



adjective
1.
(Very religious, showing reverence, sincere, devoted to religious thoughts and practices, having to do with piety) ធម្មនិដ្ឋ, ដែលចិត្ដបុណ្យ, ដែលចិត្ដល្អ
Example: The devout lie of a saint, a devout prayer, a devout wish for success.
Example: I am a devout believer in treating others the way I'd want them to treat me.
1.
devoted, godly, holy, pious, religious, reverent, sanctimonious, spiritual
1.
atheistic, impious, profane, secular, skeptical