tactfulness

Or is keeping mum about sexual yearning for another person just basic kindness, or tactfulness, or good manners?

Above all, the key to referral success on both sides involves tactfulness depending on the situation, using your judgment and of course, the quality relationship of both the referrer and candidate. 

The latter would have clapped his shoulder, but he avoided the effusive greeting with a certain quiet tactfulness which was usual with him.

Fisher, in turn, sounds as if he may want to push past the usual tactfulness when he discusses Stern, a forceful personality in every facet of the job he has held since 1984.

The two girls showed their appreciation for his tactfulness in different ways.