1. Adverb (fukushi), Na-adjective (keiyodoshi)

   very; considerably; easily; readily; fairly; quite; highly; rather

   Usually written using kana alone

   あいつは、なかなかいい奴だぜ！

2. Adverb (fukushi)

   by no means; not readily

   Usually written using kana alonewith a verb in the negative

3. Noun

   middle; half-way point

4. Noun which may take the genitive case particle 'no'

   excellent; wonderful; very good

   Usually written using kana alone

Also written 中中【なかなか】nakanaka、仲々【なかなか】nakanaka、仲仲【なかなか】nakanaka、却々【なかなか】nakanaka、却却【なかなか】nakanaka