The Duke acknowledged his thanks with a grave nod.

Usually he would give a grave nod or clasp my hand in his on taking leave of me.

The old farmer listened attentively, then gave a grave nod.

Spock paused a moment, then inclined his head in a grave nod.

Then, with a last, grave nod, Sarek walked away, pushing through the pressure curtain without looking back.

She gave a single, grave nod of her head.

Tachyon gave him a grave little nod and went to the bedroom.

"Now you see our difficulty," Alderscroft said, with a grave nod.

"This can have its advantages," Tzikas said with a grave nod.

With a grave nod, Stave stepped into the center of the contorted floor.