1. Having no owner
   - ownerless

Antonym: owned

• headrace
• headrest
• headroom
• heads-up
• heads-up display
• headsail
• headscarf
• headset
• headshake
• headshaking
• headship
• headshot
• headsman
• headspace
• headspring
• headstall
• headstand
• headstock
• headstone
• headstream
• headstrong
• headwaiter
• headwater
• headway
• headwind