Mostly they avoid heavy storms. With good weather forecasting it is possible to delay departures or take a slight detour to avoid storms and then use a bit more fuel to arrive on time. Secondly the modern cruise ships are huge giants so even large swells are quite small compared to the size of the ship. The larger ships do not have the same issues that smaller ships face. It does put more pressure on the hull which needs to be reinforced of course. And for comfort they do have stabelizers that help them stay level in bad weather.
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