Kindness can mean several things. If you mean kindness as in doing nice things for others, here are some sentences.
Kindness can also be a noun meaning the act itself, or the service.
She showed great kindness to the stray cat by feeding and sheltering it.
What kind of person is kind to another.
He always has a kind word for everyone. She has freckles. Mary has braces. John has a new car.
He turned his back on me when I needed him the most.
The hunter stalked silently through the forest, eyes trained on its prey.
She was able to achieve her goals through clever manipulation of the situation.
This is a sentence using a pronoun.The word this is a demonstrative pronoun.
A sentence using the word rhubarb is, Strawberry rhubarb is my favorite kind of pie.
If you will be kind, I can give you a cookie
The eulogy of the deceased was kind and appropriate.
She was of Irish heritage. Tell me what kind of pizza do you want.
She was a kindly heart kind of person!
I am not writing a sentence using that word.
I can give you a sentence using the word galaxy.
a sentence using the word endotracheal
This is a sentence using the word aviator.
I guiltlessly walked away from the crime scene.
I am saying a sentence using the word collagen.
This is a sentence using the word monomer. :P