recklessness

The lads’ energy pleased him but their recklessness worried him.

小伙子的劲头使他高兴,他的冒失又使他担心。

Recklessness invites disaster.

粗心大意招致灾难。

This very recklessness makes me feel that these costly operations may be only the prelude to far larger events which impend on land.

这种孤注掷的作法，使我感到这些代价重大的战役，也许正是陆上即将发生远为重大事件的个前。