He had the unmitigated gall to ask for a raise after just one month.
У него была неприкрытая наглость попросить повышение всего через месяц.
Definitions
Unmitigated gall refers to extreme audacity or boldness, often in a way that is shocking or offensive. It describes a situation where someone acts with brazen confidence, disregarding social norms or the feelings of others.