"Kindest" means being the most gentle, caring, and considerate towards others. It describes someone who is always nice and helpful to make a positive impact on people's lives. Full definition
Similarly, knowledge of kinds of foods is the basis for dietary control. (religion-online.org)
We know each other very well and we have a sense of what kind of things make each other laugh. (businessinsider.com)
But they don't do those things, so they live in kind of an extended adolescence, no closer to adulthood than they were when they graduated college. (relevantmagazine.com)