a. 无虚饰的, 单纯的, 自然的

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.