1. Not feeling or showing gratitude
   - ungrateful, thankless

See also: unappreciative

• breakneck
• breakout
• breakstone
• auditory meatus
• auditory modality
• auditory nerve
• auditory ossicle
• auditory perception
• auditory sensation
• auditory sense
• auditory system
• auditory tube
• Audubon
• Audubon warbler
• Audubon's caracara
• Audubon's warbler
• auf wiedersehen
• Aug
• Augean
• Augean stables
• Augeas
• augend
• auger
• aught
• augite