Without blots; perfectly clean or unblemished, especially in writing or character.
From blot (a spot, stain, or mark) plus -less (suffix meaning 'without'), creating an adjective meaning completely free from blemishes.
Blotless is a perfect example of English's flexibility—we can add -less to almost any noun to mean 'without it,' so writers used 'blotless' to mean having no errors or stains, which was crucial in the age of handwritten documents.
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