The meeting lasts two hours.

She is hard to convince.

Hard water can cause limescale problems in the pipes.

Hard science like mathematics requires great precision.

Hard drugs are a serious public health problem.

She is really tough.

He learned the hard way that you have to work hard to succeed.

She is a hardcore activist.

This tradition dies hard in our family.

He's really thick-skinned, nothing seems to bother him.