IPA: //ʌnˈtruːθ//
KK: /ʌnˈtruːθ/
A statement or idea that is not true; a lie or falsehood.
He was caught telling an untruth about his whereabouts last night.
Untruth → It is formed from "un-" (meaning not) and "truth" (from Old English "triewð", meaning fidelity or faithfulness). The word "untruth" means something that is not true or a falsehood.
Think of 'not' ('un-') combined with 'truth' — this helps you remember that 'untruth' refers to something that is not true.