say it: uhn-buh-LEE-vuh-buhl
unbelievable is an adjective meaning "beyond belief or understanding". It carries 2 recorded senses.
beyond belief or understanding
“at incredible speed”
“the book's plot is simply incredible”
having a probability too low to inspire belief
Definitions, synonyms and semantic relations for unbelievable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.