Both Uses of

tact
in
Mrs. Dalloway

He had worked very hard; he had won his position by sheer ability (being the son of a shopkeeper); loved his profession; made a fine figurehead at ceremonies and spoke well—all of which had by the time he was knighted given him a heavy look, a weary look (the stream of patients being so incessant, the responsibilities and privileges of his profession so onerous), which weariness, together with his grey hairs, increased the extraordinary distinction of his presence and gave him the reputation (of the utmost importance in dealing with nerve cases) not merely of lightning skill, and almost infallible accuracy in diagnosis but of sympathy; tact; understanding of the human soul.†
*

tact = the ability or act of saying or handling things in such a way that others feel good about them

said "milady" very respectfully, yet had a humorous way with her, looking at the young ladies, and ever so tactfully helping Lady Lovejoy, who had some trouble with her underbodice.†

tactfully = in a manner that makes others feel good