TRUTHFULLY
truthfully
(adverb) with truth; “I told him truthfully that I had just returned from my vacation”; “he answered the question as truthfully as he could”
Source: WordNet® 3.1
Etymology
Adverb
truthfully (comparative more truthfully, superlative most truthfully)
(manner) In a truthful manner
Frankly.
Synonyms
• (truthful manner): honestly, sincerely; see also honestly
• (frankly): actually, in point of fact, truly; see also actually
Source: Wiktionary
TRUTHFUL
Truth"ful, a.
Definition: Full of truth; veracious; reliable.
– Truth"ful*ly, adv.
– Truth"ful*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition