Antonyms of adv truthfully

1 sense of truthfully

Sense 1
truthfully -- (with truth; "I told him truthfully that I had just returned from my vacation"; "he answered the question as truthfully as he could")
       Antonym of untruthfully (Sense 1)
      => mendaciously, untruthfully -- (in a mendacious and untruthful manner; "I told him, quite untruthfully, that I had just returned from leave")

Synonyms of adv truthfully

1 sense of truthfully

Sense 1
truthfully -- (with truth; "I told him truthfully that I had just returned from my vacation"; "he answered the question as truthfully as he could")