noun
a noun is a word that represents a person, place, thing, or idea. In this case, 'second thoughts' is a noun phrase that refers to doubts or reconsiderations about a decision or course of action.
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After careful consideration, she decided to proceed with the plan without any second thoughts.
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She was about to buy the dress but then she had second thoughts and put it back.
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I was going to quit my job but I had second thoughts and decided to stick it out.
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As he stood at the edge of the cliff, he had second thoughts about jumping into the unknown abyss below.