unbreachable

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adjective un·breach·able \ˌən-ˈbrē-chə-bəl\

Definition of unbreachable

  1. :  not able to be entered, penetrated, or crossed :  impossible to breach a seemingly unbreachable divide unbreachable computer networks The four-minute mile and the 10-second 100-meter dash were once deemed unbreachable barriers. — Carlos Lozada

1866

First Known Use of unbreachable

1866


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