IPA: /ʌnˈtɛstɪd/
KK: /ʌnˈtɛstɪd/
Something that has not been tried or examined before.
The new software is still untested, so we need to be careful when using it.
Untested → It is formed from "un-" (meaning not) and "test" (from Latin "testari", meaning to witness or prove) and the suffix "-ed" (indicating a past participle). The word "untested" means not having been proven or witnessed, indicating something that has not been subjected to a test or trial.
Think of 'not' ('un-') having been 'proven' or 'witnessed' ('test') — that's why untested means something that hasn't been tested.