He moved tentatively across the ice...
Evanesce means to disappear or dissipate.
To evanesce is to gradually disappear from sight. Here is a sentence. Her bad mood will evanesce once I tell her we're having pudding for dessert.
I was earnest when I requested a transfer off the front line.
On Manuel's birthday, his friends threw him a surprise party and invited the entire school, making it a very auspicious day, indeed!