Read the dictionary definition of extremely. All definitions for this word.
1. to an extreme degree
1. extremely cold
2. extremely unpleasant
3. she is super smart
4. the night was deathly cold
5. as a child, I was deathly afraid of snakes
2. to a high degree or extent; favorably or with much respect
1. highly successful
2. He spoke highly of her
3. does not think highly of his writing
4. extremely interesting