A person of common sense; someone who acts and judges in accordance with generally accepted norms.
常識人ならそんな無責任な発言はしないだろう。
A sensible person wouldn't make such an irresponsible remark.
彼女は常識人で、周囲の人に気を配るタイプだ。
She is a sensible person who is considerate of those around her.
常識人としてまず挨拶をするのが礼儀だ。
As a person of common sense, it's polite to at least greet others.