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English word truthful comes from English truth, English -ful.

Truthful etymology ?

Truthful detailed word origin explanation

Dictionary entryLanguageDefinition
truth English (eng) (nonstandard, intransitive) To tell the truth.. (obsolete, transitive) To assert as true; to declare; to speak truthfully.. To make exact; to correct for inaccuracy. (archaic) Faithfulness, fidelity.. (countable) Something acknowledged to be true; a true statement or axiom.. (obsolete) A pledge of loyalty or faith.. (physics, dated) Topness. (See also truth quark.). Conformity to fact or [...]
-ful English (eng) Used to form adjectives from nouns. Full of, tending to, or thoroughly possessing the quality expressed by the noun.. Used to form nouns from nouns meaning “as much as can be held by what is denoted by the noun”. Used to form nouns indicating a great deal of the quantity expressed by the noun.
truthful English (eng) Accurately depicting what is real.. Honest, and always telling the truth.

Words with the same origin as truthful

Descendants of -ful
colorful delightful disgraceful doubtful graceful grateful hateful helpful hopeful hurtful joyful meaningful merciful painful peaceful resourceful respectful rightful stressful successful suspenseful thankful useful youthful