overoptimist
/ˌoʊvərˈɑptəmɪst/
noun
- A person who is excessively optimistic, often ignoring risks or negative possibilities.
- The manager was an overoptimist and refused to create a backup plan.
- Don't be an overoptimist; sometimes you need to prepare for the worst.
- My brother is an overoptimist who always thinks he'll win the lottery even though he never buys a ticket.
Antonyms