kindness
noun
°The state of being kind.
°An instance of kind or charitable behaviour.
politeness
noun
°The act of being polite.
synonyms: affability, civility, courtliness, etiquette
subtlety
noun
°The quality or fact of being subtle.
"With all his usual subtlety, he quietly fixed the problem before anyone else noticed it."
°An instance of being subtle, a subtle thing, especially a subtle argument or distinction.