Such is used to emphasize the quality or degree of something, or to refer to something of that kind that was mentioned or is understood.
From Old English 'swylc' meaning 'of that kind, the same', from Proto‑Germanic roots meaning 'so‑like'. It has long been used to point back to something already known.
In 'such a mess' or 'such talent', the word quietly turns up the emotional volume. It’s a tiny spotlight that says, 'Pay attention—this quality is intense or important.'
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