nonrespondent

noun

non·​re·​spon·​dent ˌnän-ri-ˈspän-dənt 

plural nonrespondents

: someone who is not a respondent

especially : someone who does not respond to a poll

Many nonrespondents said that they did not feel knowledgeable enough about fishing to answer the questionnaire.

—Chuck Harris and Eric Bergersen

Word History

First Known Use

1856, in the meaning defined above