1. the quality or state of being awkward, clumsy, or lacking social grace
2. lack of tact or sensitivity in social situations; rudeness or insensitivity

Examples

• His gaucheness at the formal dinner was evident when he used the wrong fork.
• The speaker's gaucheness offended several guests with his inappropriate jokes.
• She tried to overcome her natural gaucheness by taking etiquette classes.
• His gaucheness in conversation made others uncomfortable.
• The character's gaucheness was both endearing and embarrassing to watch.
• Despite her intelligence, her social gaucheness held her back in professional settings.