In a way that shows you refuse to change your mind or opinion even when others disagree with you.
From 'stubborn,' which has unclear origins but likely derives from Old English or Old Norse roots meaning 'short' or 'blunt.' The adverbial form adds '-ly,' a Germanic suffix that converts adjectives to adverbs.
Neuroscience shows that stubbornness and intelligence are surprisingly correlated—the same brain patterns that make people stick to their beliefs also make them good at pattern-matching and remembering details, which is why brilliant people can be remarkably pigheaded.
Complete word intelligence in one call. Free tier — 50 lookups/day.