The difference between Dandy and Well and good
When used as adjectives, dandy means like a dandy, foppish, whereas well and good means basically good, but with some shortcoming or limitation.
Dandy is also noun with the meaning: a man very concerned about his clothes and his appearance.
check bellow for the other definitions of Dandy and Well and good
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Dandy as an adjective:
Like a dandy, foppish.
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Dandy as an adjective:
Very good; better than expected but not as good as could be.
Examples:
"That's all fine and dandy, but how much does it cost?"
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Dandy as an adjective:
Excellent; first-rate.
Examples:
"What a dandy little laptop you have."
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Dandy as a noun:
A man very concerned about his clothes and his appearance.
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Dandy as a noun (British, nautical):
A yawl, or a small after-sail on a yawl.
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Dandy as a noun:
A dandy roller.
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Well and good as an adjective (idiomatic):
Basically good, but with some shortcoming or limitation.
Examples:
"Having 200,000 entries is all well and good, but the data will be useless unless people can find what they need."