1. lacking good manners, refinement, or proper upbringing
Usage: somewhat formal or dated
2. of inferior breeding or genetic quality
Usage: used of animals

Examples

• His underbred behavior at the dinner party embarrassed his hosts.
• She considered his crude jokes to be underbred and inappropriate.
• The underbred dog showed none of the characteristics of its supposed lineage.
• Despite his wealth, his underbred manners revealed his humble origins.
• The breeder refused to sell underbred puppies to serious competitors.
• Her underbred speech patterns made her feel self-conscious at the formal event.