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tamperproof

or tam·per-proof

[ tam-per-proof ]
/ ˈtæm pərˌpruf /
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adjective
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. 2023
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