A whirlwind romance is a passionate fling that sweeps one off their feet. It's a love affair that takes people on a thrilling ride of love, passion, and excitement. However, there are several alternatives to using the phrase 'whirlwind romance.' Some of these synonyms include 'intense romance,' 'incandescent love,' 'crazy love affair,' 'fervent love affair,' and 'compelling passion.' Other synonyms include 'blazing love affair,' 'passionate attachment,' 'fierce attraction,' 'fiery romance,' and 'sizzling love affair.' While each term conveys the excitement and fervor of a love affair, they all offer a slightly different nuance to the experience.