The phrase "growing without check" is best synonymized with which word?

The word "rampant" accurately captures the essence of the phrase "growing without check." When something is described as rampant, it indicates that it is flourishing or spreading unchecked, often in a wild or uncontrolled manner. This aligns perfectly with the idea of growth that is not restrained or regulated.

In contrast, the other options do not convey the same meaning. "Supple" refers to something that is flexible or easily bent, which does not relate to unrestrained growth. "Rambunctious" describes someone or something that is noisy and full of energy, but it lacks the specific context of unrestricted growth. "Stately" suggests an impressive or dignified appearance or manner, again failing to reflect the concept of uncontrolled expansion suggested by "growing without check."