underarm
1. [ adverb ] with the hand swung below shoulder level'
Synonyms: underhand
Examples:

"throwing a ball underarm"

2. [ adjective ] (sports) with hand brought forward and up from below shoulder level
Synonyms: underhanded underhand
Examples:

"an underhand pitch" "an underhand stroke"

Related terms: overhand sport
Similar spelling:   under_arms
  under
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  underframe
  undermanned
  underfur
  underage
  undersea
  underact
  undercoat
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  unmoderated
  understated
  undertaker
  underactive
  under_wraps
  underrating
  underwater
  undercover
  undersealed
  undercoated
  under_it
  underbid
  underpay
  underdog
  underfed
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  undertow
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  undraped
  unutterable
  undercut
  unutterably