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tamperproof

or tam·per-proof

[tam-per-proof]
adjective
  1. that cannot be tampered with; impervious to tampering: a tamper-proof lock.
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Origin of tamperproof

First recorded in 1885–90; tamper1 + -proof
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for tamperproof

adj.

also tamper-proof, 1886, from tamper (v.) + proof.

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Online Etymology Dictionary, © 2010 Douglas Harper