Pronunciation: /flaɪ-baɪ-naɪt/
noun a person or thing that is unreliable or untrustworthy, especially in business
A1 I heard that the new store in town is a fly-by-night operation.
A2 The company turned out to be a fly-by-night business that disappeared overnight.
B1 Consumers should be wary of fly-by-night companies that offer deals that seem too good to be true.
B2 Investors lost money when they realized the investment was in a fly-by-night scheme.
C1 The government is cracking down on fly-by-night businesses that scam people out of their money.
C2 She was able to uncover the fly-by-night operation and report it to the authorities.
adjective relating to or characteristic of a person or thing that is unreliable or untrustworthy, especially in business
A1 I don't trust that fly-by-night company.
A2 The fly-by-night mechanic did a shoddy job on my car.
B1 The fly-by-night online retailer disappeared with customers' money.
B2 She was warned about the fly-by-night investment scheme, but still chose to participate.
C1 The company's reputation was tarnished by accusations of being a fly-by-night operation.
C2 Investors were wary of the new startup, fearing it might be another fly-by-night venture.
formal The company was accused of being a fly-by-night operation due to its lack of transparency and stability.
informal I wouldn't trust that fly-by-night company with my money.
slang That fly-by-night business is probably a scam, be careful.
figurative His fly-by-night attitude towards relationships never allowed him to form any lasting connections.
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more fly-by-night
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is flying by night
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to fly by night
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flying by night