noun
a person or thing that is unreliable or untrustworthy, especially in business
adjective
relating to or characteristic of a person or thing that is unreliable or untrustworthy, especially in business
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The company was accused of being a fly-by-night operation due to its lack of transparency and stability.
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I wouldn't trust that fly-by-night company with my money.
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That fly-by-night business is probably a scam, be careful.
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His fly-by-night attitude towards relationships never allowed him to form any lasting connections.