Use 'gauche' to describe someone who makes others uneasy in social situations. Mark was so gauche that he talked about his diet plans at a wedding buffet.
Pro Tip 2/3
Unintended Rudeness
'Gauche' often implies unintentional rudeness due to lack of social awareness. Apologizing for her gauche comment, she hadn't realized it was a sensitive topic.
Pro Tip 3/3
Cultural Nuance
'Gauche' can vary with cultural norms; what's awkward in one culture might not be in another. In his culture, burping is polite, but here it's considered rather gauche.