1. Impossible to subdue
   - indomitable, never-say-die

See also: unconquerable

• overhead projector
• overhead railway
• overhear
• overheat
• overheated
• overheating
• overindulge
• overindulgence
• overindulgent
• overinflated
• overjealous
• overjoy
• overjoyed
• overkill
• overladen
• overland
• overlap
• overlapping
• overlarge
• overlay
• overlayer
• overleaf
• overleap
• overlie
• overlip