1.
national character, national traits, national temperament
The characteristic qualities, values, or behavioral tendencies perceived as typical of the people of a particular nation. Often discussed in cultural comparisons and essays about national identity.
Usage
国民性 is commonly used in essays, cultural discussions, and media commentary. While useful for discussing broad cultural tendencies, it is important to note that the concept involves generalizations. The suffix 性 here means "nature" or "character."