Distinctively means “in a distinctive way”: with a special quality that makes the thing easy to recognise. She dresses distinctively. The soup tastes distinctively of sesame. You will often meet it in front of an adjective: distinctively sweet, distinctively Taiwanese, a distinctively round face. That pattern is very common in writing. The word does the same job as distinctive, only it tells you about how something is done or how it comes across, not what kind of thing it is. It is a little more at home on the page than in quick talk; in conversation people may just say “in her own way” or “you can tell.”