形容詞 artless:

1. characterized by an inability to mask your feelings; not devious
   同義詞：ingenuous
2. simple and natural; without cunning or deceit
3. showing lack of art
4. (of persons) lacking art or knowledge
   同義詞：uncultivated, uncultured

art.less

adj.（形容詞）
Having or displaying no guile, cunning, or deceit.See Synonyms at naive
不詭詐的：沒有或顯示不出狡詐，狡猾或欺詐的參見 naive
Free of artificiality; natural:
不矯揉造作的；自然的：
例句：
artless charm.
自然的魅力

Lacking art, knowledge, or skill; uncultured and ignorant.
拙劣的：缺乏藝術(shù)性，知識(shí)或技巧的；無教養(yǎng)和無知的
Poorly made or done; crude.
粗制的：笨拙地制或做的；粗制的

【引伸】
art.lessly
adv.（副詞）
art.lessness
n.（名詞）