"underhand" in the adjective sense

1. underhand, underhanded, underarm

with hand brought forward and up from below shoulder level

"an underhand pitch"

"an underhand stroke"

2. sneaky, underhand, underhanded

marked by deception

"achieved success in business only by underhand methods"

"underhand" in the adverb sense

1. underhandedly, underhand

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

2. underarm, underhand

with the hand swung below shoulder level

"throwing a ball underarm"

Source: WordNet® (An amazing lexical database of English)

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