Meaning : With truth.
I told him truthfully that I had just returned from my vacation.
He answered the question as truthfully as he could.
In a mendacious and untruthful manner.I told him, quite untruthfully, that I had just returned from leave.
Truthfully ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Truthfully ka matlab kya hota hai?