Other forms: somewhats
The word somewhat means "slightly" or "to a moderate extent." Being somewhat excited to go on a trip means you're kind of looking forward to it, but you're not completely over-the-top thrilled about the prospect.
A movie that you find somewhat interesting may hold your attention, at least for a while, but it doesn't fully amaze you. It probably won't stick with you after you've left the theater. Similarly, if you're somewhat tired, you're neither completely exhausted nor bursting with energy. The word somewhat captures the middle ground, where something is noticeable but not very pronounced and definitely not extreme.