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tamperproof

or tamper-proof

[tam-per-proof] /ˈtæm pərˌpruf/
adjective
1.
that cannot be tampered with; impervious to tampering:
a tamper-proof lock.
Origin of tamperproof
1885-1890
1885-90; tamper1 + -proof
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for tamperproof
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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