The word "balloter" refers to a person who participates in a vote or election. Its antonyms could be non-voter, abstainer, or indifferent. A non-voter is someone who does not take part in the voting process, either due to a lack of interest or disapproval of the candidates or issues. An abstainer is someone who refrains from voting voluntarily, perhaps due to religious, moral, or personal reasons. Finally, an indifferent person is someone who doesn't care about the result of the election and doesn't bother to participate. While it is always advisable to engage in the democratic process, there could be various reasons for someone to be an antonym of a balloter.