His lips formed a hard line and his eyes turned cold.
It's a hard line for me to walk.
Mix a little sincerity and gumption in your hard-line approach, and perhaps you'll get somewhere and not antagonize others.
It was filmed in Greece in 1974, at no small risk, under the hard-line rule of the Greek colonels ' junta.
I think some hard-line evangelicals have trouble with the idea of Grace.