What term describes something impressively great in size, force, or extent?

The term "prodigious" is the correct choice because it specifically conveys the idea of something that is extraordinarily large, powerful, or significant. It encapsulates the notion of impressiveness in size or extent, often used to describe exceptional talents, efforts, or natural phenomena.

For example, one might refer to a prodigious effort in a creative undertaking or a prodigious storm that has immense impact. The essence of the word reflects a sense of wonder or awe relating to its scale or intensity.

Other options like "pretentious" refer to an attitude of superiority, often in a showy or exaggerated manner; "problematic" relates to issues or difficulties; and "prevaricate" means to speak falsely or evasively. These words serve different contexts and do not convey the same sense of impressive magnitude as "prodigious."