他们粗心大意，还没意识到危险。

They were carelessly unaware of the danger.

Source: Tatoeba

Sentence Composition

1 他们 tāmen they; them
2 粗心大意 cūxīndàyì
  1. negligent
  2. careless
  3. inadvertent
3 还没 háiméi not yet
4 意识到 yìshídào to be aware of; to realize
5 危险 wēixiǎn
  1. danger
  2. dangerous