Unassailable

"Unassailable" in French

inattaquable

(secure against attack; impregnable)

incontestable

(undeniable, incontestable or incontrovertible)

indéniable

(undeniable, incontestable or incontrovertible)

inexpugnable

(secure against attack; impregnable)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.