Curiosity
noun
You like it because it gives you an odd feeling in your heart. You don't quite know what it is you like, but that's because it's curiosity that you have.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
サトシ君は好奇心いっぱいですね！
Satoshi is full of curiosity, isn't he!
最近好奇心が刺激されるような経験してないなー。
These days, I don't experience anything that stimulates my curiosity.
ウォータースライダーでびしょびしょにぬれてしまい、他の人から好奇心に満ちた目で見られた。
I got soaked on the water slide, and people were looking at me with curious eyes.
子どもの頃、私は好奇心旺盛でした。
When I was a child I was full of curiosity.