Etymology
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truthful (adj.)

"habitually speaking truth," 1590s, from truth + -ful. Related: Truthfully; truthfulness.

updated on February 19, 2014

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Definitions of truthful from WordNet

truthful (adj.)
expressing or given to expressing the truth;
a truthful person
gave truthful testimony
Synonyms: true
truthful (adj.)
conforming to truth;
a truthful statement
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.