mendacious

adjectives

given to lying
"a mendacious child"
is derived from
is similar to
not expressing or given to expressing the truth
"the statement given under oath was untruthful"; "an untruthful person"
intentionally untrue
"a mendacious statement"
is derived from
is similar to
not in accordance with the fact or reality or actuality
"gave false testimony under oath"; "false tales of bravery"