1. Not easy to believe
   "behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains"
   - improbably, implausibly, unbelievably 
2. Exceedingly; extremely
   - fabulously, fantastically

See also: incredible

Antonym: credibly

• cuboidal cell
• cuboidal epithelial cell
• cucking stool
• cuckold
• cuckoldom
• cuckoldry
• cuckoo
• cuckoo bread
• cuckoo clock
• cuckoo spit
• cuckoo's nest
• cuckoo-bumblebee
• cuckooflower
• cuckoopint
• Cuculidae
• cuculiform bird
• Cuculiformes
• Cuculus
• Cuculus canorus
• cucumber
• cucumber tree
• cucumber vine
• cucumber-shaped
• Cucumis
• Cucumis melo