- The definition of underhanded is sneaky or deceitful.
An example of something underhanded is a plot to ruin someone's date.
underhanded definition by Webster's New World
- not open or straightforward; secret, sly, deceitful, etc.
underhanded - Business Definition
Of or describing a person or activity that is deceitful: To head off managers bailing out to competing firms, the underhanded CEO falsely promised that the firm was not contemplating any layoffs.