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"dutiful" is also used as a crossword clue. If that's what you saw, the answer is often conscientious (13 letters).
Definitions
willingly obedient out of a sense of duty and respect
Word origin
From duty + -ful.
Used in a sentence
“Ralph was a dutiful child, and took the trash out without being told.”
“And when blondes and beautiful are multiple / They become so dull and dutiful”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Obedient from obligation”7 letters
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