Acting or done in a deceptive, secret, or sly manner; dishonest and sneaky. The definition of underhanded is sneaky or deceitful. An example of something underhanded is a plot to ruin someone's date.

What does it mean to do something underhanded?

adjective. Definition of underhanded (Entry 2 of 2) : marked by secrecy, chicanery, and deception : not honest and aboveboard : sly an underhanded attempt to gain power.

What is another word for underhanded?

Some common synonyms of underhanded are clandestine, covert, furtive, secret, stealthy, and surreptitious.