noun
person of common sense; sensible person
Refers to someone who has sound, practical judgment and behaves in a socially reasonable manner.
彼は常識人だから、そんな無茶はしないよ。
He's a sensible person, so he wouldn't do anything that reckless.
常識 is the abstract concept of common sense, while 常識人 refers to a person who embodies it.
Compound of 常識 (common sense) and 人 (person).