Final answer:
The synonym for 'hazy' in the provided list is 'nebulous', which also describes something that is unclear or vague.
Step-by-step explanation:
The word hazy has a synonym in the list provided: nebulous. Both words describe something that is vague, unclear, or clouded, often used to describe literal fog or metaphorical uncertainty. The other options such as sedulous (diligent and hardworking), ebullient (cheerful and full of energy), and non sequitur (a statement that does not logically follow from the previous argument) do not share the same meaning.