worst of all

idiom

Definition of worst of all

used to refer to the least pleasant or appealing part of something that has many bad partsI forgot my backpack, was late for class, and worst of all, I discovered I'd studied the wrong material for the test.

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“Worst of all.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/worst%20of%20all. Accessed 30 Oct. 2020.

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