Consistently telling the truth; honest.(adjective)
Corresponding to reality; true.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "truthful" in a sentence
"U.S. military commanders say they're just countering in the information battle space with what they call truthful and reliable information."
"The others headed their flimsy "Sad Accident," a title truthful but not alluring."
"First off, no one here knows who you are or how truthful is your claim."