I've seen 優しい in the form 優しさ and don't really know how it translates.
Reading adjective conjugations here: [url]http://en.wiktionary.org/wiki/安い[/url]
It says using さ means degree. So does 優しさ translate to: degree of kindness (noun)?
Also, I'm not familiar with karo, kere, kare conjugations for adjectives. First time seeing them.
よろしく