Final answer:
The word 'optimistic' means having a positive outlook or belief that things will turn out well. In this context, the opposite of optimistic is 'uncertain.'
Step-by-step explanation:
The word 'optimistic' refers to having a positive outlook or belief that things will turn out well. In the given context, where the dad was doubtful about the weather and supplies, the opposite of optimistic would be 'uncertain.' So, the correct answer is 'uncertain.'
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