Source : Webster's Revised Unabridged Dictionary (1913)

Tactful \Tact"ful\, a.
   Full of tact; characterized by a discerning sense of what is
   right, proper, or judicious.

Source : WordNet®

tactful
     adj 1: having or showing a sense of what is fitting and considerate
            in dealing with others; "she was tactful enough not to
            shatter his illusion"; "a tactful remark eased her
            embarrassment" [ant: {tactless}]
     2: showing skill and sensitivity in dealing with people; "by
        diplomatic conduct he avoided antagonizing anyone"; "a
        tactful way of correcting someone"; "the agency got the
        kid-glove treatment on Capitol Hill" [syn: {kid-glove}]