All 4 Uses

tact
in
A Spool of Blue Thread
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Most people just tactfully discarded them, but Marge Ellis brought a whole handful to the Whitshanks' front door, where Red accepted them with a confused look on his face.†
p. 64.3 *

tactfully = in a manner that makes others feel good
But he might think she was tactlessly reminding him that he was not a Whitshank.†
p. 164.2

tactlessly = in an offensive manner

standard suffix: The suffix "-lessly" in tactlessly means in a manner that is without. This is the same pattern you see in words like harmlessly, fearlessly, and remorselessly.
He was furious at Mrs. Brill for witnessing it, even though he had to admit that she had behaved very tactfully.†
p. 327.1

tactfully = in a manner that makes others feel good
In a way, it was her tact he was furious at.†
p. 327.1

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

Definitions:

(1) (tact)
the ability or act of saying or handling things in such a way that others feel good about them
(2) (meaning too rare to warrant focus)