Deviating from a standard; not straight, even, level, or exact. (adjective)
Disloyal; unfaithful. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "untrue" in a sentence
"Even as Mr. Rangel pleaded for understanding, he also decried what he called the untrue assertions that he was corrupt or a criminal."
"A Pakistani security official denied the report, which he called "untrue" and "malicious"."
"The bank has had to fend off charges, which it calls untrue, that it has historic roots in the slave trade."