dogged

“Still, the dogged obstinacy of his race held him to the pace he had set, and would hold him till he dropped in his tracks.”

“Rushing out to the point above the reef, we watched the conflict between canoe and sea. When the man reached the gas boat, the screams of the boy stopped. With great risk they loaded the canoe till she began to take water. The boy bailed furiously. The long dogged pull of the man's oars challenged death inch by inch, wave by wave.”

“"I'm afraid I've given him a heap of trouble. You see," he explained, looking at Paul critically, "I never thought of eating before I left town, and one gets so dogged hungry, you know walking. I say it is a long tramp, isn't it?"”

“At night proctors patrolled the street and dogged your steps if you tried to go into any haunt where the presence of vice was suspected.”

“They will replace the four five-car Class 180 Adelantes [...] that have been dogged by poor reliability.”