1. With hand brought forward and up from below shoulder level
   - underhand, underhanded

1. With the hand swung below shoulder level
   "throwing a ball underarm"
   - underhand

Encyclopedia: Underarm

• seek
• seek out
• seek time
• seeker
• seeking
• seel
• Seeland
• seem
• seeming
• seemingly
• seemless
• seemliness
• seemly
• seep
• seepage
• seeping
• seer
• seeress
• seersucker
• seesaw
• seethe
• seether
• seething
• Segal
• segment