Secure
Secure adjective - Immune to attack; incapable of being tampered with.
Usage example: a secure telephone connection
Unattackable is a synonym for secure. In some cases you can use "Unattackable" instead an adjective "Secure".
Unattackable
Unattackable adjective - Immune to attack; incapable of being tampered with.
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Synonyms for Unattackable
Mutual synonyms
Cite this Source
Unattackable and Secure. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/secure/unattackable
Secure & Unattackable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/secure/unattackable>.
Unattackable or Secure. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/secure/unattackable.
Google Ngram Viewer shows how "secure" and "unattackable" have occurred on timeline