INCREDIBLE
incredible, unbelievable
(adjective) beyond belief or understanding; “at incredible speed”; “the book’s plot is simply incredible”
Source: WordNet® 3.1
Etymology
Adjective
incredible (comparative more incredible, superlative most incredible)
(literal) Too implausible to be credible; beyond belief; unbelievable. [from 15th c.]
(figurative) Amazing; astonishing; awe-inspiring.
(figurative) Marvellous; profoundly affecting; wonderful.
Synonyms
• unbelievable
Source: Wiktionary
In*cred"i*ble, a. Etym: [L. incredibilis: cf. OF. incredible. See In-
not, and Credible.]
Definition: Not credible; surpassing belief; too extraordinary and
improbable to admit of belief; unlikely; marvelous; fabulous.
Why should it be thought a thing incredible with you, that God should
raise the dead Acts xxvi. 8.
Source: Webster’s Unabridged Dictionary 1913 Edition