in bad faith

in bad faith idiom
With the intention of deceiving someone or doing harm, as in I'm sure they were acting in bad faith and never planned to pay us. This expression was first recorded in 1631. The antonym, in good faith, meaning “sincerely and honestly,” as in I signed that contract in good faith, dates from about 1350.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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