Webster's English Dictionary

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incredible

in.cred.i.ble \(')in-'kred-*-b*l\ \-ble-\ aj [ME, fr. L incredibilis, fr. 
   fr. in- + credibilis credible] : too extraordinary and improbable to admit 
   of belief; also : har d to believe - in.cred.i.ble.ness n