Carsick, as we all know, refers to the feeling of nausea, dizziness or vomiting associated with travelling in a vehicle. Interestingly, there are some antonyms for the word carsick that are worth knowing. One of them is 'motion sickness,' which refers to discomfort caused by travelling by any mode of transportation. Another antonym could be 'land sickness,' which is a rare condition that affects people who have spent extended periods at sea and then return to land. It is characterised by dizziness, nausea and fatigue. Overall, it's essential to know these antonyms to understand the different causes and remedies for different types of sicknesses.