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

See also: loose, unfixed

• genus Nyctimene
• genus Nymphaea
• genus Nymphalis
• genus Nymphicus
• genus Nypa
• genus Nyssa
• genus Oceanites
• genus Ochna
• genus Ochotona
• genus Ochroma
• genus Ocimum
• genus Octopus
• genus Ocyurus
• genus Odobenus
• genus Odocoileus
• genus Odontaspis
• genus Odontoglossum
• genus Odontophorus
• genus Oecanthus
• genus Oedogonium
• genus Oenanthe
• incrust
• incrustation
• incubate
• incubation