Locked
Mutual synonyms
Both words in one sentence
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Death Trap: The interior of the bank safe is filled with acid nozzles, which will kill Batman (now locked inside it) but keep the money pristine and secure, which is actually clever.
Source: Film / Batman Forever -
The earliest volumes are kept locked away even from the rest of the highly-secure archive.
Source: Great Big Library of Everything - Although unlocking that door only lets you into another locked room, this one more secure.
Source: Paper Key Retrieval Trick
Cite this Source
Secure and Locked. (2016). Retrieved 2026, August 18, from https://thesaurus.plus/related/locked/secure
Locked & Secure. N.p., 2016. Web. 18 Aug. 2026. <https://thesaurus.plus/related/locked/secure>.
Secure or Locked. 2016. Accessed August 18, 2026. https://thesaurus.plus/related/locked/secure.
Google Ngram Viewer shows how "locked" and "secure" have occurred on timeline