'extraordinary kindness' is correct and usable in written English.
It is used to describe someone's kind behaviour which is above and beyond what is expected. For example: "The young boy showed extraordinary kindness by helping the elderly lady cross the street."
Exact(32)
He's a man of such extraordinary kindness".
Irwin's lively sense of humor and extraordinary kindness and empathy inspired in others affection and love.
Your extraordinary kindness, caring, warmth and generosity will always be remembered.
This true gentleman will be missed for his wit, compassion, integrity and extraordinary kindness.
He will be remembered by his family and friends for his extraordinary kindness and thoughtfulness.
Bob's extraordinary kindness, generosity and infectious sense of humor will be sorely missed by all who knew him.
Similar(22)
She will always be remembered for her extraordinary loving kindness.
His family, friends and community will never forget his extraordinary principles, kindness and strength.
Val was a true woman of valor, a woman of extraordinary wisdom, kindness and integrity.
His family, friends and community will never forget his extraordinary principles, kindness and strength as a leader.
We will remember the extraordinary love, kindness, compassion and consideration that she bestowed on all who came in contact with her throughout her life.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com