In a manner that shows deep religious commitment or sincere dedication to something you believe in.
From 'devotional' (adjective meaning relating to religious devotion) plus '-ly' adverb suffix. 'Devotional' comes from Latin 'devotio' meaning dedication or loyalty, derived from 'devovere' (to vow or dedicate).
This word reveals how English adds '-ly' to turn almost any adjective into an adverb—but 'devotionally' is special because it's one of the few adverbs that captures both spiritual AND secular commitment, showing how medieval religious language shaped modern English.
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