tamperproof

or tam·per-proof

[tam-per-proof]

adjective

that cannot be tampered with; impervious to tampering: a tamper-proof lock.

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.

Online Etymology Dictionary, © 2010 Douglas Harper