1. Not ostentatious
   - unostentatious, unpretentious

See also: quiet, restrained

• understandability
• understandable
• understandably
• understanding
• understandingly
• understate
• understated
• understatement
• understock
• understood
• understrength
• understructure
• understudy
• undersurface
• undertake
• undertaker
• undertaking
• underthings
• undertide
• undertone
• undertow
• undervaluation
• undervalue
• undervest
• underwater