1. Incapable of being perceived or known
   - incognoscible, incognisable [Brit]

See also: imperceptible, unperceivable

• polo stick
• polo-neck
• polo-neck collar
• polonaise
• polonium
• polony
• Polska
• poltergeist
• poltroon
• poltroonery
• poly
• polyamide
• polyamory
• polyandrian
• polyandrist
• polyandrous
• polyandry
• Polyangiaceae
• Polyangium
• polyanthus
• polyarchy
• polyarteritis
• polyarteritis nodosa
• polyatomic
• polybasic