unconnected
adjective /ˌʌnkəˈnektɪd/
  /ˌʌnkəˈnektɪd/
- not related or connected in any way
- The two crimes are apparently unconnected.
 - unconnected with/to something My resignation was totally unconnected with recent events.
 - The judge was unconnected with the company representatives.
 - The question was unconnected to anything they had been discussing.
 
Oxford Collocations DictionaryUnconnected is used with these nouns:- reason