1. superlative form of untrue; most false or inaccurate
Usage: superlative form
2. superlative form of untrue; most disloyal or unfaithful
Usage: superlative form

Examples

• That was the untruest statement he had ever made.
• Her accusations were the untruest of all the claims presented.
• The witness gave the untruest testimony in the entire trial.
• He proved to be the untruest friend she had ever known.
• The untruest rumors spread fastest through the school.
• Of all the stories told, his was the untruest version of events.