afflicted and lowly: a person bowed down by hardship, poverty, or oppression, and so dependent on God for help
This word describes the person who has been pressed low. The picture underneath it is of someone bent under a weight: crushed by poverty, ground down by a more powerful neighbor, or worn out by suffering. It is not a neutral word for low income. It names the felt experience of being at the bottom with no way to lift yourself out.
Its senses are not separate ideas so much as one condition seen from different angles. The materially poor person, the victim being exploited, and the humble worshiper who looks to God are all the same kind of person: someone who has no leverage of their own and must depend on someone stronger. The Bible keeps these dimensions close on purpose. The reason the poor and wronged can be confident is that God takes their side, and the reason the humble are blessed is that they have stopped relying on their own strength.
Because this person cannot defend themselves, the word carries a strong note of protection. The law commands special care for the afflicted, the prophets condemn those who trample them, and the Psalms put the word in the mouth of the sufferer crying out to God. To call someone afflicted is, in this world, also to put them under God's particular attention.
Over time, especially in the late Psalms and the prophets, the same word edges toward an inner posture. The afflicted person who keeps trusting God becomes a model of the rightly humble worshiper. So a single word can name both an outward hardship and the lowliness of heart that hardship can produce. By the Second Temple period, this trajectory led communities to take the term as a self-designation for those who depend wholly on God.