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fly-by-night

A fly by night is an unreliable person who is generally not known and who cannot be trusted. (noun)

An example of a fly by night is a contractor who takes your money to produce your kitchen cabinets and then never produces them.

A fly by night describes an unreliable person who is generally not known and who cannot be trusted. (adjective)

An example of fly by night person is the description used for a salesman who promises the world but doesn't deliver.

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See fly-by-night in Webster's New World College Dictionary

See fly-by-night in American Heritage Dictionary 4

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