expression, noun
serious topic; stiff conversation
Refers to a conversation or topic that is formal, serious, or lacking in lightheartedness. Often used when the atmosphere becomes heavy or businesslike.
食事中に固い話はやめましょう。
Let's avoid serious topics during the meal.
会議が終わって、やっと固い話から解放された。
The meeting ended, and I was finally free from the stiff conversation.