infatuated
Strong but short-lived crush or obsession with someone or something.
Infatuated means having an intense but shallow romantic interest in someone, often based more on fantasy than reality. When you're infatuated with someone, you might think about them constantly, feel nervous around them, and imagine they're absolutely perfect. But you probably don't know them very well yet.
The key thing about infatuation is that it's usually temporary and based on surface things: how someone looks, a few charming moments, or an idealized version you've created in your mind. A student might become infatuated with a new classmate after one conversation, suddenly thinking that person is the most amazing human ever.
Infatuation feels powerful but tends to fade quickly once you get to know the real person, with their actual personality, habits, and flaws. It's different from genuine love or deep friendship, which grow stronger as you truly understand someone over time.
People can also be infatuated with ideas or things, like becoming obsessed with a new hobby for a few weeks before moving on to something else. The word suggests an overwhelming but short-lived fascination that burns bright but doesn't last.