believing that what you hope for is likely to happen [= optimistic]
Everyone's feeling pretty hopeful about the future.
I'm hopeful that we can find a solution.
be hopeful of (doing) something British English
He is still hopeful of playing in Saturday's game.
making you feel that what you hope for is likely to happen [= promising]:
The vote is a hopeful sign that attitudes in the church are changing.
Things might get better, but it doesn't look very hopeful right now.
—hopefulness noun [uncountable]