Unwashed can be pictured as the moment before the water: a cup, a hand, a shirt that the tap has not touched yet. Un- simply takes the washing away. What is left is usually dirt, and always the feeling of something still waiting to be dealt with.
可以想成「水還沒碰到它」的那一刻：一個杯子、一隻手、一件衣服。un- 把「洗過」這件事整個拿掉。剩下的通常是髒，而且總帶著一種「該做的事還沒做」的感覺。
From the word’s history
The word is un- plus washed, recorded in Middle English as unwasched, so the picture has never been anything other than the washing that did not happen.
這個字就是 un- 加 washed，中古英語寫作 unwasched。所以它的畫面從頭到尾都只有一件事：那個沒發生的清洗。
Wiktionary, "unwashed"
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