1. Too sacred to be uttered
   - ineffable, unnameable, unspeakable, unutterable 
2. Not capable of being said
   - unspeakable

See also: sacred

• caricature plant
• caricaturist
• caries
• carillon
• carillon playing
• carillonneur
• carina
• carina fornicis
• carinal
• carinate
• carinate bird
• carinated
• caring
• carioca
• cloud seeder
• cloud up
• cloud-covered
• cloud-cuckoo-land
• cloudberry
• cloudburst
• clouded
• cloudiness
• clouding
• clouding up
• cloudless