Etymology
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devout (adj.)

c. 1200, of persons, "yielding reverential devotion to God," especially in prayer, "pious, religious," from Old French devot "pious, devoted, assiduous" (Modern French dévot) and directly from Latin devotus "given up by vow, devoted" (source also of Spanish and Portuguese devoto), past participle of devovere "dedicate by vow" (see devotion). Of actions, "expressing devotion or piety," late 14c. Meaning "sincere, solemn" is from mid-15c. Related: Devoutly; devoutness.

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Definitions of devout

devout (adj.)
deeply religious; "a god-fearing and law-abiding people" H.L.Mencken;
Synonyms: god-fearing
devout (adj.)
sincerely earnest;
devout wishes for their success
Synonyms: dear / earnest / heartfelt
From wordnet.princeton.edu