Stronger, more passionate:
* Besotted: This implies a state of being completely captivated and enamored.
* Enraptured: Suggests being filled with overwhelming joy and delight.
* Smitten: Implies a sudden and intense feeling of love or attraction.
* Enamored: Signifies being charmed and captivated by someone or something.
* Head over heels: A playful way to describe being deeply in love.
More focused on the intensity of the feeling:
* Obsessed: This implies an unhealthy, all-consuming preoccupation with someone or something.
* Consumed: Suggests being completely taken over by an emotion or feeling.
* Fixated: Indicates a strong and persistent focus on someone or something.
More neutral, focusing on the short-lived nature of the feeling:
* Captivated: Implies a strong interest and fascination.
* Beguiled: Suggests being charmed and deceived by someone or something.
* Enchanted: Indicates a feeling of wonder and delight.
The best synonym for "infatuated" will depend on the specific context and the shade of meaning you wish to convey.