In a manner resembling or characteristic of cattle; in a slow, dull, or stolid way.
From bovine (relating to cattle, from Latin bovinus) plus the adverbial suffix -ly. The word emerged in English to describe behavior or qualities reminiscent of cattle—slow, methodical, or lacking intelligence.
The word captures a fascinating prejudice: cattle have been stereotyped as stupid and slow since ancient times, so 'bovinely' became an insult implying dull-wittedness. It reveals how we've built entire vocabularies of animal insults reflecting which creatures we find most boring!
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