Of the nature of, or having the characteristics of, a jade; of or pertaining to a jade. Of a horse.

Of a horse or (occasionally) another animal: bad-tempered, vicious. Obsolete.

Of animals (esp. horses): Inclined to be savage or dangerous, or to show bad temper; not submitting to be thoroughly tamed or broken-in.

Of a horse: Like a jade; tricky, jadish.

U.S. Of horses: Vicious. Also of persons: bad-tempered.