unsolicited
adjective /ˌʌnsəˈlɪsɪtɪd/
  /ˌʌnsəˈlɪsɪtɪd/
- not asked for and sometimes not wanted- unsolicited advice
- The record company receives dozens of unsolicited demo tapes each week.
 Oxford Collocations DictionaryUnsolicited is used with these nouns:- advice
- attachment
- call
- …