If someone does something sanguinely, they do it in a hopeful and confident way.
Doing something sanguinely means you are feeling good and sure about it.
Examples:
She sanguinely believes everything will be okay.
He sanguinely walked into the room, ready to face the challenge.
They sanguinely faced the problem, knowing they could solve it.
I sanguinely went to the test, thinking I would do great.
The superhero sanguinely fought the villain, knowing they would win.
The little boy sanguinely jumped into the pool, sure he could swim.