Having qualities somewhat like an author or characteristic of authors; somewhat authorly or pretentious in a literary way.
From 'author' plus the suffix '-ish' (Old English origin, meaning 'somewhat' or 'rather'). This suffix creates informal adjectives that suggest partial resemblance or mild qualities.
The '-ish' suffix is brilliant for expressing skepticism—calling something 'authorish' implies it's trying to be literary or author-like but not quite convincingly, which is a subtle linguistic shade you won't find in formal writing.
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