1. In a serious manner
   "the speech was weighty and it was weightily delivered" 
2. As something very heavy
   "she moved weightily"

See also: weighty

• undershorts
• undershot
• undershrub
• underside
• undersign
• undersize
• undersized
• underskirt
• underslung
• undersoil
• underspend
• understaffed
• understand
• understandability
• understandable
• understandably
• understanding
• understandingly
• understate
• understated
• understatement
• understock
• understood
• understrength
• understructure