A person who is prone to despond; someone who frequently loses hope or becomes discouraged.
From 'despond' (verb) plus the agent suffix '-er', which creates nouns indicating someone who performs an action. A specialized term for a person characterized by hopelessness.
Desponder is so archaic that most modern English speakers won't recognize it, but it appears in old psychological texts to describe someone with a melancholic temperament—a personality type they took very seriously.
Complete word intelligence in one call. Free tier — 50 lookups/day.