Synonyms of truthful

1 Syllable
frank, truest, straight, truer, true, real, just
2 Syllables
correct, factual, kosher, open, moral, frankest, straight-out, forthright, exact, true-blue, square, candid, washer, faithful, trustier, righteous, legit, actual, true-life, lieger, franker
3 Syllables
guileless, truth-telling, reliable, trustable, straightforward, plainspoken, realistic, bare-faced, heart-to-heart, ingenuous, unfeigned, trustworthy, precise, veracious, outspoken, sincere, scrupulous, plain-dealing, straight-arrow, sure-enough, literal, unfaked
4 Syllables
openhearted, believable, honorable, moralistic, unrefuted, unreserved, veritable, aboveboard, veridical, reputable, pretenseless, square-shooting, undissembling
5 Syllables
unembellished, undeceptive, circumstantiated, naturalistic
6 Syllables
authoritative