Slowly的词性是副词(adverb),Slowly的比较级(comparative)是:more slowly;而slowly的最高级(superlative)则是most slowly。值得一提的是,根据Wiktionary,slowly的比较级和最高级还可以是:slowlier, slowliest。不过,Wiktionary自己也标注说,这种用法属于uncommon(不常用),见下图。所以,一般而言,人们普遍接受的形式是more slowly, most slowly。参考例句:Could you speak more slowly, please? (麻烦您能说慢一点吗?)
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https://en.wiktionary.org/wiki/slowly
http://forum.wordreference.com/threads/slowlier-or-more-slowly.731310/
https://english.stackexchange.com/questions/78244/speak-slower-or-speak-slowlier