1. Lacking affection or warm feeling
   "an uncaring person"
   - detached, unaffectionate 
2. Without care or thought for others
   - thoughtless, unthinking

See also: inconsiderate, unloving

• owner-occupier
• ownerless
• ownership
• ox
• ox-eyed
• ox-eyed daisy
• oxacillin
• oxalacetate
• oxalacetic acid
• oxalate
• oxalic acid
• Oxalidaceae
• oxalis
• Oxalis acetosella
• Oxalis caprina
• Oxalis cernua
• Oxalis corniculata
• Oxalis crenata
• Oxalis pes-caprae
• Oxalis tuberosa
• Oxalis violacea
• oxaloacetate
• oxaloacetic acid
• Oxandra
• Oxandra lanceolata