unbreachable
adjective
un·breach·able
ˌən-ˈbrē-chə-bəl
: 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
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Merriam-Webster unabridged
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