underbred

[ uhn-der-bred ]

/ ˌʌn dərˈbrɛd /

having inferior breeding or manners; vulgar.

not of pure breed, as a horse.

Origin of underbred

First recorded in 1640–50; under- + bred

un·der·breed·ing

[uhn-der-bree-ding] /ˌʌn dərˈbri dɪŋ/, noun

I assumed that it had been developed in the City, where Charlie was picking up the curious nasal drawl of the underbred City man.

The Works of Rudyard Kipling: One Volume Edition |Rudyard Kipling
If the girl had been awkward or underbred, she could have taken her in hand with a good grace.

The Girls at Mount Morris |Amanda Minnie Douglas
Underbred, un′dėr-bred, adj. of inferior breeding or manners, vulgar: not pure-bred.

Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) |Various
I should be sorry for him myself—if only he were not such an underbred beast!

Punch, or the London Charavari, Volume 93, October 8, 1887 |Various

There's something so underbred about crankiness; and the Harwich family have always been essentially aristocrats.

Bella Donna |Robert Hichens

underbred

/ (ˌʌndəˈbrɛd) /

of impure stock; not thoroughbred

a less common word for ill-bred

underbreeding, noun