noun
a person, place, thing, or idea
adjective
a word that describes or modifies a noun
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The proposal to launch a manned mission to Mars is considered a crazy idea by many experts.
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Tom came up with a crazy idea to start a business selling customized socks.
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I had this totally crazy idea to dye my hair bright pink, but I chickened out.
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Thinking you can finish all your work in one day is just a crazy idea.