Well (adverb)

1. In a good or satisfactory manner.
2. In a favorable or advantageous way.
3. Truly or accurately.
4. To a considerable extent or degree.
5. In good health or spirits.

Origin:

Middle english, from old english wel; akin to old high german wella well, old english willa desire, latin volare to fly.

Examples:

1. She sings well.
2. He speaks well of his boss.
3. That's well said.
4. I feel well today.
5. You did well on the test.