truthfully

in a way that shows you are telling the truth or being honest

honestamente, sinceramente

Collocations answer truthfully

• He answered the question truthfully.

  Él respondió la pregunta honestamente.

used for emphasizing that something is true or real, especially when this surprises people

realmente, en realidad

Collocations truthfully speaking

• Truthfully speaking, I don't know.

  Realmente, no lo sé.