If you are tactful, you have a knack for saying the right thing at the right time. A tactful person is appropriate and sensitive, never rude or careless.

Tactful means "full of tact." What's tact? It's the gift for saying the right thing because you understand what the situation calls for. So, if you are tactful, you wouldn't tell your friend that the food at her party was awful — you'd talk about the interesting conversation you had and the great music. But even when tactful people have to give criticism, they do it in such a way that the other person doesn't get offended.

Definitions of tactful

adj 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”
showing concern for the rights and feelings of others
discerning, discreet
unobtrusively perceptive and sympathetic
tactless, untactful
lacking or showing a lack of what is fitting and considerate in dealing with others
lacking regard for the rights or feelings of others
lacking in refinement or grace or good taste
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adj showing skill and sensitivity in dealing with people

“a tactful way of correcting someone”
diplomatic, diplomatical
using or marked by tact in dealing with sensitive matters or people