dogged

"Ye-es, sir," returned Jerry, in something of a dogged manner.

As it was, she drove him to a dogged pursuit of the man he was convinced was the real culprit.

"The Signorina is not for him," repeated Gaspare, with a dogged emphasis.

Not dogged, trapped, made desperate by fate, but cheerfully and of his own free will.

It made a dogged, desperate resistance and was almost unbeatable.

"There's nothing like a dogged persistence," said the Russian.

I remember with wonder the sort of dogged fierceness I displayed.

Ten years of it—ten years of dogged work and unrelieved failure.

He was possessed by the dogged desire to establish the truth of his story.

Roger, with dogged thoroughness, followed the trail suggested by Dick.