Emphasizing Completeness or Extremity:
* The room was utterly silent, the only sound being the ticking of the clock.
* She was utterly exhausted after the long journey.
* The news was utterly devastating, leaving everyone speechless.
Expressing a Strong Negative:
* I am utterly convinced that he is lying.
* This project is utterly pointless.
* The food was utterly disgusting.
Creating a Dramatic Effect:
* The magician's act was utterly unbelievable.
* Her performance was utterly mesmerizing.
* The scenery was utterly breathtaking.
Remember, "utterly" is an intensifier, so it adds a strong emphasis to the word it modifies.