Adjective
Not truthful; unveracious; contrary to the truth or the fact.
Source: Webster's dictionarythe statement given under oath was untruthful Source: Internet
an untruthful person Source: Internet
Eliot, T. S. Inventions of the March Hare: Poems 1909-1917 (Harcourt, 1997) ISBN 0-15-100274-6 As to earlier etymology the Oxford English Dictionary cites bull with the meaning "trivial, insincere, untruthful talk or writing, nonsense". Source: Internet
Doris alleged that Uche Elendu is being untruthful just as she is trying to take advantage of the situation at hand. Source: Internet
And it’s not even really a lie, she backs into it, being untruthful by not speaking—which is the same thing, ultimately. Source: Internet
A third, head diving coach John Appleman, instead pointed out to investigators that he had heard the diver had been untruthful in the past. Source: Internet