somebody who commiserates with anyone who has had misfortune
- an individual who shares your emotions or opinions and hopes that you'll be effective
- One who sympathizes
- a person who sympathizes.
1815, representative noun from sympathize.
Reeder (1807-1864), who showed himself a pro-slavery sympathizer as first Territorial governor, was removed from office for favouring the free-state party; he became a leader in the free-state cause.