1. Not accessible to direct observation

See also: imperceptible, unperceivable

• cured
• curer
• curet
• curettage
• curette
• curettement
• curfew
• Curia
• curie
• Curie point
• Curie temperature
• Curietherapy
• curing
• curio
• curiosa
• curiosity
• curious
• curiously
• curiousness
• Curitiba
• curium
• curl
• curl up
• curled
• curled leaf pondweed