Noah Webster's Dictionary (a.) Not credible; surpassing belief; too extraordinary and improbable to admit of belief; unlikely; marvelous; fabulous.

Multi-Version Concordance Incredible (2 Occurrences) John 6:62 "Does this seem incredible to you? What then if you were to see the Son of Man ascending again where He was before? (WEY) Acts 26:8 Why is it judged incredible with you, if God does raise the dead? (WEB KJV ASV DBY WBS YLT NAS RSV NIV)