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Essentially, Danish was more continental/German and thus kept a German influence, while the Swedes stayed north and had to deal with Norway as their second neighbour. Thus, Swedish became far more "Norwegian", though Norway was initially settled by the Danes and Swedes (or other Germanic tribes south of them), their language is really watered down. Maybe "feminine isn't the right word to use but there's definitely something going on with Swedish and Norwegian that makes them sound a lot weirder than Danish. For Norwegian in particular, it's like Swedish but every word ends with a bounce. For instance, the word "helvede" or "helvete", meaning "hell" (there's also "faen" but that's less used). In Danish, it just goes "Helvede". Hel-ve-duh (just remember the soft d). Meanwhile in Norwegian it's "Hel-ve-TA!". Swedish has this too but it's less prevalent.
I'm not really familiar with Icelandic, but hearing it, it's basically an older version of Norwegian. Faroese is far more "Danish" but it's still clearly Norwegian-derived when listening to it.
By the way, Sønderjysk/Synnejysk is its own language as well. It has Æ instead of den/det for "the", and has a lot of German and Frisian words in it like "Mojn". Some Danes, especially from the isles think it sounds just like what Swedes think Danish as a whole sounds. Maybe they're the northern Hungarians of Denmark, except that they're still located within Denmark, though perhaps some are in Germany.