Poor
い adjective
This is a single kanji with an い on the end, meaning you know it's probably an adjective. What's the adjective form of poor? It's poor.
You know the word 先ず (まず)? It means something along the lines of "first of all." So, if you're poor, first of all (まず), you're going to want to get some help. Second of all, learn how to play the guitar and make funny jokes.
大人になったら、貧しい人々を助けるために活動をしたいと思っています。
When I grow up, I want to work to help poor people.
私の日本語のボキャブラリーはまだまだ貧しいです。
My vocabulary in Japanese is still quite poor.
彼女のくらしは貧しいけれど、心はとても豊かです。お金持ちだけど心が貧しい人より、彼女の方がとても好感が持てます。
Her life may be poor, but her heart is very rich. I find her much more likable than someone who is wealthy but poor in spirit.