Source : Webster's Revised Unabridged Dictionary (1913)

Artless \Art"less\, a.
   1. Wanting art, knowledge, or skill; ignorant; unskillful.

            Artless of stars and of the moving sand. --Dryden.

   2. Contrived without skill or art; inartistic. [R.]

            Artless and massy pillars.            --T. Warton.

   3. Free from guile, art, craft, or stratagem; characterized
      by simplicity and sincerity; sincere; guileless;
      ingenuous; honest; as, an artless mind; an artless tale.

            They were plain, artless men, without the least
            appearance of enthusiasm or credulity about them.
                                                  --Porteus.

            O, how unlike the complex works of man, Heaven's
            easy, artless, unencumbered plan!     --Cowper.

   Syn: Simple; unaffected; sincere; undesigning; guileless;
        unsophisticated; open; frank; candid.

Source : WordNet®

artless
     adj 1: characterized by an inability to mask your feelings; not
            devious; "an ingenuous admission of responsibility"
            [syn: {ingenuous}] [ant: {disingenuous}]
     2: simple and natural; without cunning or deceit; "an artless
        manner"; "artless elegance" [ant: {artful}]
     3: showing lack of art; "an artless translation"
     4: (of persons) lacking art or knowledge [syn: {uncultivated},
        {uncultured}]