INCONVINCIBLE
Source: 566, 567
inconvincible. Inconvincible, a. that is not to be convinced
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In′con‐vin″ci‐ble (?), a. [[L. inconvincibilis. See In- not, and Convince.]] Not convincible; incapable of being convinced. None are so inconvincible as your half-witted people. Gov. of the Tongue.