Expecting a favorable outcome or dwelling on hopeful aspects
Inclined to hope for the best, or to expect it
I think that's an optimistic count of the number of participants.
Jorge was optimistic and always saw the best in every situation.
Kant, though pessimistic as regards the actual man, is optimistic regarding his moral capacity.
Aristotle was optimistic of great achievements over the whole range of the sciences.
Kevin would rather spend time with Bob, his optimistic friend, than his cynical and gloomy friend, Victor.