Synonyms of underhanded

Adjective

1. sneaky, underhand, underhanded, crooked (vs. straight), corrupt

usage: marked by deception; "achieved success in business only by underhand methods"

2. underhand (vs. overhand), underhanded, underarm

usage: with hand brought forward and up from below shoulder level; "an underhand pitch"; "an underhand stroke"

Definition and meaning of underhanded (Dictionary)