"underarm" in the adjective sense
1. underhand, underhanded, underarm
with hand brought forward and up from below shoulder level
"an underhand pitch"
"an underhand stroke"
"underarm" in the adverb sense
1. 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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