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
  1. adjective
    marked by deception
    synonyms: sneaky, underhand
    corrupt, crooked
    not straight; dishonest or immoral or evasive
  2. adjective
    with hand brought forward and up from below shoulder level
    synonyms: underarm, underhand
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    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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