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"dogged" is also used as a crossword clue. If that's what you saw, the answer is often persisting (10 letters).
Definitions
Determined and persistent despite difficulty.
Word origin
From Middle English dogged, doggid, doggyd (“characteristics similar to that of a dog”), equivalent to dog + -ed.
Used in a sentence
“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.”
“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.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Persistent”6 letters
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