tact  noun [U]
 the ability to say or do the right thing without making anyone unhappy or angry
 The young nurse showed great tact in dealing with worried parents.
 He's never had much tact and people don't like his blunt manner.

 tactful  adjective
 Mentioning his baldness wasn't very tactful.

 tactfully  adverb
 We must explain, as tactfully as possible, that she has made a mistake.

 tactless  adjective
 It was rather tactless of you to invite his ex-girlfriend.

 tactlessly  adverb

 tactlessness  noun [U]