a. 天然的, 朴实的, 缺乏艺术性的

Inartificial \In*ar`ti*fi"cial\, a. [Pref. in- not + artificial:
cf. F. inartificiel.]
Not artificial; not made or elaborated by art; natural;
simple; artless; as, an inartificial argument; an
inartificial character. -- {In*ar`ti*fi"cial*ly}, adv. --
{In*ar`ti*fi"cial*ness}, n.