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

• androecium
• androgen
• androgenesis
• androgenetic
• androgenic
• androgenic hormone
• androgenous
• androgeny
• androglossia
• androgyne
• androgynous
• androgyny
• android
• andromeda
• Andromeda galaxy
• Andromeda glaucophylla
• Andromeda polifolia
• androphobia
• Andropogon
• Andropogon furcatus
• Andropogon gerardii
• Andropogon scoparius
• Andropogon virginicus
• androsterone
• andryala