"They (Dumbledore and Grindelwald) got on like a cauldron on fire" -Bathilda Bagshot
Someone who becomes easily infatuated. Infatuation will occur a ridiculous amount of times and each time the said infatutard will in fact believe they are experiencing true love. Infatutardedness can cost a person friendships, happiness, and sanity. Yet, they continue to repetitively become infatuated, continuing to believe that they are feeling real love, despite all evidence to the contrary.
The majority of people who believe they are "in love" are merely infatutards.
Romeo Montague is one prime example of an infatutard in classic literature.