Etymology
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marvelous (adj.)

c. 1300, merveillous, "causing wonder, of wonderful appearance or quality," from Old French merveillos "marvelous, wonderful" (Modern French merveilleux), from merveille (see marvel (n.)). Weakened sense of "splendid, very nice" is by 1924. The adverbial sense of "wonderfully, surprisingly" (early 14c.) is archaic or obsolete. Related: Marvelously; marvelousness.

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Definitions of marvelous

marvelous (adj.)
extraordinarily good or great; used especially as intensifiers;
a marvelous collection of rare books
marvelous (adj.)
too improbable to admit of belief;
Synonyms: improbable / marvellous / tall
marvelous (adj.)
being or having the character of a miracle;
Synonyms: marvellous / miraculous
From wordnet.princeton.edu