Definitions

1. adjective

most unpolished, unrefined, or unsophisticated in manner or behavior

“She was considered the gauchest person in the group, often speaking her mind without thinking about the consequences.”

2. superlative form of ‘gauche’

used to describe something as more unpolished, unrefined, or unsophisticated in manner or behavior than something else

“He was the gauchest person at the dinner party, accidentally knocking over a glass of wine.”