Something marvelous is unusual, wonderful, and almost miraculous. Finding a bag of gold would be marvelous by any standard.

Something that's decent or even simply good isn't marvelous. A marvelous thing needs to be really stunning, exceptional, or hard to believe. Marvelous things make people marvel at them — they're amazing and a little shocking, like a miracle. Winning the lottery would be marvelous. Finding out that ice cream is actually good for you would be marvelous. And if you want to make someone feel extra nice, tell them their new hat looks marvelous.

Definitions of marvelous

adj extraordinarily good or great ; used especially as intensifiers

“a marvelous collection of rare books”
fantastic, grand, howling, marvellous, rattling, terrific, tremendous, wonderful, wondrous
beyond what is ordinary or usual; highly unusual or exceptional or remarkable

adj too improbable to admit of belief

improbable, marvellous, tall
incredible, unbelievable
beyond belief or understanding

adj being or having the character of a miracle

marvellous, miraculous
not existing in nature or subject to explanation according to natural laws; not physical or material

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