well-bred
US /ˌwelˈbred/
UK /ˌwelˈbred/
1.
having or showing good manners and a refined upbringing
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She was a well-bred young lady, always polite and graceful.
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His well-bred demeanor made him stand out in the crowd.
2.
of good stock or parentage (especially of animals)
:
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The champion racehorse was known for its well-bred lineage.
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Only well-bred dogs are allowed to compete in this show.