secret; clandestine / (by extension) dishonest and sneaky; done in a secret or sly manner / (in various ball games, of a ball) thrown (etc.) with the hand brought forward and up from below

with an underhand movement / in a sly, sneaky or secret manner

To toss or lob with an underhand movement. / To trick, deceive or gull. / (mining) To excavate downward in successive steps or horizontal slices while positioned above on unbroken ore.

(textiles) The lower of two hands, the hand under the work.

Done by moving the hand (and arm) from below. / Sly, dishonest, corrupt, cheating. / Insincere; sarcastic. / Secret; surreptitious. / Understaffed.

In an underhanded manner.

simple past tense and past participle of underhand

Devious people, collectively.

plural of underhander

A ball thrown or bowled underhand. / One who throws or bowls a ball underhand. / One whose personality inclines toward taking revenge by underhand means.