Untruthful \Un*truth"ful\, a. Not truthful; unveracious; contrary to the truth or the fact. -- {Un*truth"ful*ly}, adv. -- {Un*truth"ful*ness}, n.
untruthfully adv : in a mendacious and untruthful manner; "I told him, quite untruthfully, that I had just returned from leave" [syn: {mendaciously}] [ant: {truthfully}]