What is the definition of Unadd Definition?

An 'unadd definition' is like trying to explain the concept of 'ghost in the machine'. It's a phrase that tries to describe something that's so vague it's like trying to pin down a black hole - both mysterious and impossible to grasp in full.

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Here's an edgy example sentence: "The 'unadd definition' of existential dread was a 7 on my panic scale, but the ghost in the machine still got me."