noun
A sudden thought is a noun that refers to an idea or notion that comes to mind unexpectedly or without warning.
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As I was reading the report, a sudden thought occurred to me about a potential solution to the problem.
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I was just sitting there when a sudden thought popped into my head out of nowhere.
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I was chilling with my friends and then this sudden thought hit me like a ton of bricks.
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Like a bolt from the blue, a sudden thought illuminated my mind with a new perspective.