unbreachable

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

Definition of unbreachable

: 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

Recent Examples of unbreachable from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unbreachable.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unbreachable

1866

in the meaning defined above

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