'Alone' in the Bible

I didn't sit in the assembly of those who make merry, nor rejoiced; I sat alone because of your hand; for you have filled me with indignation.

when the king of Babylon's army was fighting against Jerusalem, and against all the cities of Judah that were left, against Lachish and against Azekah; for these [alone] remained of the cities of Judah [as] fortified cities.

Arise, go up to a nation that is at ease, that dwells without care, says Yahweh; that have neither gates nor bars, that dwell alone.