The word “ Incredible”Is many times used to describe something In a positive way but the word “Incredible”means to not be believable.
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in·cred·i·ble
/inˈkredəb(ə)l/
adjective
impossible to believe.
"an almost incredible tale of triumph and tragedy"
synonyms:unbelievable, beyond belief, hard to believe, unconvincing, far-fetched, implausible, improbable, highly unlikely, dubious, doubtful.