To toss or lob with an underhand movement.
To trick, deceive or gull.
To excavate downward in successive steps or horizontal slices while positioned above on unbroken ore.
Devious people, collectively.
Done by moving the hand (and arm) from below.
Sly, dishonest, corrupt, cheating.
His underhanded trick backfired and he was disqualified.
Insincere; sarcastic.
An underhanded compliment is actually criticism.
Secret; surreptitious.
Understaffed.