plebeian

1. ADJ A person, especially one from an earlier period of history, who is plebeian, comes from a low social class. 平民; 庶民[usu ADJ n]

2. ADJ If someone describes something as plebeian, they think that it is unsophisticated and connected with or typical of people from a low social class. 平民的; 粗俗的[正式] [usu ADJ n]

...a philosophy professor with an alarmingly plebeian manner. ...一位擧止粗俗不堪的哲學教授。