don't know

/ˈdoʊnt ˌnoʊ/
noun
  1. A person who has not made up their mind or does not have an opinion, especially in a vote or survey.
    • The campaign is trying to convince the don't-knows before election day.
    • Many don't-knows decided to vote for the independent candidate at the last minute.
    • In the latest poll, twenty percent of voters were don't-knows.
Synonyms
What does "don't know" mean? | whatsthatwordmean | whatsthatwordmean