Verses with the word careless in the Old Testament (5 verses):

Judges 18:7
Then the five men departed, and came to Laish, and saw the people that were therein, how they dwelt careless, after the manner of the Zidonians, quiet and secure; and there was no magistrate in the land, that might put them to shame in any thing; and they were far from the Zidonians, and had no business with any man.

Isaiah 32:9
Rise up, ye women that are at ease; hear my voice, ye careless daughters; give ear unto my speech.

Isaiah 32:10
Many days and years shall ye be troubled, ye careless women: for the vintage shall fail, the gathering shall not come.

Isaiah 32:11
Tremble, ye women that are at ease; be troubled, ye careless ones: strip you, and make you bare, and gird sackcloth upon your loins.

Ezekiel 30:9
In that day shall messengers go forth from me in ships to make the careless Ethiopians afraid, and great pain shall come upon them, as in the day of Egypt: for, lo, it cometh.