The tongue of a bell, and figuratively of a manor woman.

–From the 1811 Dictionary of the Vulgar Tongue.

Inconsiderate, thoughtless, easily imposed on.

–From the 1811 Dictionary of the Vulgar Tongue.

Merriam-Webster

Appearing or causing to appear dazed, confounded, or nonplussed : expressionless (a blank stare)

1811 Vulgar Tongue

To look blank; to appear disappointed or confounded.

Anne

Not really a Regency word, but I decided to include it since I found it in the Vulgar Tongue Dictionary and usually find it very humorous to use.

The man is in his altitudes, i.e. he is drunk.

–From the 1811 Dictionary of the Vulgar Tongue.