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adj. 1. So implausible as to elicit disbelief; unbelievable: gave an incredible explanation of the cause of the accident. 2. Astonishing, extraordinary, or extreme: dressed with incredible speed. [Middle English, from Latin incrēdibilis : in-, not; see IN-1 + crēdibilis, believable; see CREDIBLE.] in·cred′i·bili·ty, in·credi·ble·ness n. in·credi·bly adv. |
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