adjective
existing only as the product of unchecked imagination; fantastically visionary or improbable
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The scientist's chimerical experiments pushed the boundaries of genetic engineering.
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Her dreams of becoming a famous singer seemed chimerical at first, but now she's on her way to stardom.
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I thought his idea of starting a business with no money was chimerical, but somehow he made it work.
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The artist's chimerical paintings transported viewers to a fantastical world beyond imagination.