Definition: A serious person does not laugh often. Level: B1
我父亲是个严肃的人，很少讲笑话。
My father is a ___serious man who rarely tells jokes.
经理看起来很严肃，但他实际上很平易近人。
The manager appears ___serious, but he's actually quite approachable.
他太严肃了，欣赏不了无厘头的喜剧。
He's too ___serious to enjoy silly comedies.
