A sudden tremor shook the ground, causing the coffee cups to rattle on the counter. What does the word tremor mean?

"She felt a sudden tremor in her hands as she opened the envelope with the results." What does the word tremor mean?

The solitary fox was seen at dusk, moving swiftly through the dense forest. What does the word solitary mean?

She was versatile enough to handle both graphic design and web development, making her an asset to the team. What does the word versatile mean?

He tried to placate his angry brother by buying him a gift and apologizing for the argument. What does the word placate mean?