'Careless' in the Bible

I tell you that on the day of judgment people will have to account for every careless word they speak.

That [careless and unworthy participation] is the reason why many among you are weak and sick, and a number sleep [in death].

in which you once walked. You were following the ways of this world [influenced by this present age], in accordance with the prince of the power of the air (Satan), the spirit who is now at work in the disobedient [the unbelieving, who fight against the purposes of God].

be not careless of the gift in thee, that was given thee through prophecy, with laying on of the hands of the eldership;

Wherefore, I will not be careless always to remind you concerning these things, though, having known them, and having been established in the present truth,