Adjective
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marked by deception
"achieved success in business only by underhand methods"
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with hand brought forward and up from below shoulder level
"an underhand pitch"
"an underhand stroke"
Adverb
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with the hand swung below shoulder level
"throwing a ball underarm"
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slyly and secretly
"Mean revenge, committed underhand"- John Donne
"oldline aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"- C.G.Bowers