He focused everything on the road, in grim concentration.

The Arab had the machine pistol and was lifting it with the grim concentration of a drunken man.

As she drove along, Zena summed up her present situation with grim concentration.

Trying to calm the pounding of her heart, she resumed working with grim concentration.

Victoria's mouth tightened in grim concentration as she worked to keep both opponents at bay.

He thought with a grim concentration of Bud Gregory.

Her eyes closed in grim concentration as the cord pushed further.

For nearly ten minutes he manipulated the dials with grim concentration.

Instead, there seemed to be grim concentration on their faces, an earnestness that spoke of a plan.

Working in an office is hard for me, and college was simply impossible because of the grim concentration neces-sary.