Impossible, or very difficult, to believe: The meaning of incredible is too extraordinary and improbable to be believed. So extraordinary as to seem impossible.
Gout Gout runs 10.04 seconds in 100m heat, wins 100m The Courier Mail
How to use incredible in a sentence. So implausible as to elicit disbelief; See examples of incredible used in a sentence.
Meanings, etymology, pronunciation and more in the oxford english dictionary
