a keen sense of what to say or do to avoid giving offense; skill in dealing with difficult or delicate situations.

a keen sense of what is appropriate, tasteful, or aesthetically pleasing; taste; discrimination.

touch or the sense of touch.

noun

carelessness , indiscretion , tactlessness , thoughtlessness

noun

acumen , acuteness , address , adroitness , amenity , aptness , care , common sense , consideration , control , courtesy , delicacy , delicatesse , diplomacy , discernment , discretion , discrimination , gallantry , good taste , head , horse sense * , intelligence , judgment , penetration , perception , perspicacity , poise , policy , politicness , presence , prudence , refinement , repose , savoir faire , sensitivity , skill , smoothness , suavity , subtlety , tactfulness , understanding , urbanity , savoir-faire , finesse