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

• Federation of Saint Kitts and Nevis
• federation of tribes
• federative
• Federative Republic of Brazil
• Federico Fellini
• federita
• fedora
• fee
• fee simple
• fee splitting
• fee-tail
• feeble
• feebleminded
• feeblemindedness
• feebleness
• feebly
• feed
• feed bunk
• feed grain
• feed in
• feed on
• feed upon
• feedback
• feedback circuit
• feedback loop