artless vs ingenuous

artless and ingenuous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
artless	No	Yes	No	No
ingenuous	No	Yes	No	No

As adjectives, artless and ingenuous are synonyms defined as:

artless and ingenuous: characterized by an inability to mask your feelings; not devious

artless (adjective)	ingenuous (adjective)
simple and natural; without cunning or deceit	characterized by an inability to mask your feelings; not devious
characterized by an inability to mask your feelings; not devious	lacking in sophistication or worldliness
(of persons) lacking art or knowledge
showing lack of art