Origin: Germanic Old English prefix
Underhand has 8 different meanings across 2 categories:
The lower of two hands, the hand under the work.
To toss or lob with an underhand movement.
with hand brought forward and up from below shoulder level
"an underhand pitch"
"an underhand stroke"
marked by deception
"achieved success in business only by underhand methods"
secret; clandestine
slyly and secretly
"Mean revenge, committed underhand"
"oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"
with an underhand movement