1. Of unmixed ancestry
   "full-blooded Native American"
   - full-blood, blooded 
2. Endowed with or exhibiting great bodily or mental health
   - hearty, lusty, red-blooded

See also: healthy, purebred

• undersign
• undersize
• undersized
• underskirt
• underslung
• undersoil
• underspend
• understaffed
• understand
• understandability
• understandable
• understandably
• understanding
• understandingly
• understate
• understated
• understatement
• understock
• understood
• understrength
• understructure
• understudy
• undersurface
• undertake
• undertaker