inadvertent

形容词 inadvertent:

1. without intention (especially resulting from heedless action)
   同义词：accidental

1. An inadvertent inquiry would have brought us into troubled waters.
   一次调查不当心，就会使我们陷入混乱局面。

in.ad.ver.tent

adj.（形容词）
Not duly attentive.
未留心的：未加适当注意的
Marked by unintentional lack of care.See Synonyms at careless
疏忽造成的：以粗心大意为特征的参见 careless

【引伸】
in.adver.tently
adv.（副词）