Use the adjective underhanded to describe someone who plays dirty tricks, like a cheating poker player or a manipulative classmate.

It would be underhanded to spread gossip about your opponent during a student council election, just as it's underhanded for a business owner to pay herself more while laying off workers. If it's unfair and sneaky, it's underhanded — unless you're pitching a softball, in which case you're simply throwing it from below your shoulder instead of above.

Definitions of underhanded

adj marked by deception

sneaky, underhand
corrupt, crooked
not straight; dishonest or immoral or evasive

adj with hand brought forward and up from below shoulder level

underarm, underhand
overarm, overhand, overhanded
with hand brought forward and down from above shoulder level
with the arm swung round at shoulder height
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