I don't know if it's kosher to make up your own definition. But I'm going to replace the word nice in my vocabulary and I'm borrowing parts of the definitions I want to describe me.
pleasing; agreeable; delightful
characterized by, showing, or accuracy,precision, skill, tact or care
may be relied on;
dependable in achievement, accuracy, honesty
a good or benevolent nature or disposition, as a person: having, showing, or proceeding from benevolence: considerate, or helpful; humane
esteem for or a sense of the worth or excellence of a person
relaxed free from stress; easygoing; carefree
Treating people with respect because there is a worthiness in all people because they are created by God, in His image, even if they don't treat me well.
What's not included.
No doormat in the definition.
No acting nice just because.