1. The quality of being insensitive, impolite, or inconsiderate in social interactions; absence of diplomacy or sensitivity in dealing with others
His lack of tact offended everyone at the dinner party.
A falta de tato dele ofendeu todos na festa de jantar.
2. An inappropriate or insensitive remark or action
It was a lack of tact to mention her weight gain.
Foi uma falta de tato mencionar o aumento de peso dela.