the destitute poor: a person who has nothing and must depend on others to survive
This is the strongest word the New Testament has for poverty. It does not describe the working person who scrapes by with nothing to spare; it describes the person who has fallen below survival, who owns nothing and lives by begging or by the charity of others. The picture buried in the word is a beggar bent over with hand out, shrinking back in shame.
In ordinary Greek the word was an insult, marking someone shamed, homeless, and socially invisible. What changed it was the way the Old Testament was translated into Greek: there this word became the standard term for the poor, and it picked up everything the Hebrew prophets and psalms had said about the afflicted, namely that the poor are not merely unfortunate but are the people God watches over and promises to lift up. So in the New Testament the word still names the genuinely destitute, but it carries that added weight: these are the people Jesus declares blessed and the people God has chosen.
Because the core idea is having nothing at all, the word is also used a few times as a vivid image: something or someone called "poor" in this sense is bankrupt, powerless, unable to give what others need. The literal meaning and the figurative one share the same heart, so they are held together here as one word rather than split apart.
The senses below sort the uses by emphasis: the plainly material poor who fill most of the occurrences, the poor singled out as the favored heirs of God's kingdom, and the handful of places where the word paints a picture of being spiritually or utterly bankrupt.