"Apprehensive" means feeling anxious or fearful about a future event or situation. It suggests a sense of unease or worry about what might happen.
"Rigorous," on the other hand, means strict, demanding, or thorough. It often refers to a process that is precise and disciplined, requiring careful attention to detail or adherence to established standards.
In summary, "apprehensive" relates to feeling worry or anxiety, while "rigorous" pertains to a strict or thorough approach.
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