The ability to say and do the right thing at the right time: address, diplomacy, savoir-faire, tact.

What does tactfulness mean?

: having or showing the ability to do or say things without offending other people. Other Words from tactful. tactfully \ -​fə-​lē \ adverb. tactfulness noun.

Is tactfulness a noun?

The sense of touch; feeling. (music) The stroke in beating time. Sensitive mental touch; special skill or faculty; nice perception or discernment; ready power of appreciating and doing what is required by circumstances.