Poor in Spirit

Exact phrase "poor in spirit"
Proverbs 16:18-19 Pride goes before destruction, And a haughty spirit before stumbling. It is better to be humble in spirit with the lowly Than to divide the spoil with the proud.
(Those who are poor, socially lowly)

Similar phrases:
"Oppressed" or "hard" in spirit-- I Samual 1:15 (wife mocked for inability to conceive)

Anguish of my spirit/bitterness of my soul-- Job 7:11 (Disease, death of family, loss of riches)

Brokenhearted/crushed in spirit-- Psalm 34:18 (troubled, afflicted)

Forsaken and grieved in spirit-- Isaiah 54:6 (wife cast away)

Contrite and humble spirit-- Isaiah 57:15 (judged by God for sin)

Spirit of fainting-- Isaiah 61:3 (imprisoned for debt)

Spirit is troubled-- Lamentations 1:20; 2:11 (distress over destruction of Jerusalem)

Heat of my spirit-- Ezekiel 3:14 (confusion over vision of seeing God)

Spirit troubled-- Daniel 2:1-- (disturbing dream)

my spirit distressed-- Daniel 7:15-- (disturbing visions)

Conclusion: The use of a anguished state with the phrase "in spirit" or "my spirit is" is a way of communicating an inner response to an outer trouble or calamity. It is not just an emotional state, caused by one's own sense of unworthiness or "humility". To be "poor" or anawim in spirit is to be greatly distressed due to one's poverty.