Fourwheelers, also known as all-terrain vehicles (ATVs), are a popular means of transportation for off-road adventures. However, sometimes it is necessary to refer to the opposite of a fourwheeler. In this context, the antonyms for fourwheelers could be two-wheelers, bicycles, skateboards, or even walking. Two-wheelers can refer to motorcycles or bicycles, which are suitable for paved roads or mild off-road terrains. Skateboards, on the other hand, are a popular form of transportation most commonly used on paved roads. And, walking is the most common form of transportation, which is suitable for light exercise or exploring the surrounding terrain. Therefore, antonyms for the word "fourwheelers" can include two-wheelers, bicycles, skateboards, and walking.