1. Not firmly or solidly positioned
   "an unfirm stance"
   - unsteady 
2. (of soil) unstable
   "unfirm earth"
   - shifting

See also: loose, unfixed

• piolet
• pion
• pioneer
• pious
• pious platitude
• piously
• piousness
• pip
• pip out
• pip-squeak
• Pipa
• Pipa americana
• Pipa pipa
• pipage
• pipal
• pipal tree
• pipe
• pipe bomb
• pipe bowl
• pipe clamp
• pipe cleaner
• pipe cutter
• pipe down
• pipe dream
• pipe fitter