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fly-by-night

[ flahy-bahy-nahyt ]
/ ˈflaɪ baɪˌnaɪt /
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See synonyms for: fly-by-night / fly-by-nights on Thesaurus.com

adjective
not reliable or responsible, especially in business; untrustworthy: a fly-by-night operation.
not lasting; brief; impermanent; transitory: a fly-by-night theater.
noun Also fly-by-nighter.
a person or thing that is unreliable, especially a debtor who evades or attempts to evade creditors.
a person regarded as a poor credit risk.
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Origin of fly-by-night

First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use fly-by-night in a sentence

British Dictionary definitions for fly-by-night

fly-by-night
/ informal /

adjective
unreliable or untrustworthy, esp in finance
brief; impermanent
noun Also: fly-by-nighter
an untrustworthy person, esp one who departs secretly or by night to avoid paying debts
a person who goes out at night to places of entertainment
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Cultural definitions for fly-by-night

fly-by-night

Shady or untrustworthy: “Before buying stock in a newly formed company, the prudent investor will check its owners' credentials to make sure it's not a fly-by-night operation.”

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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