IPA: //nɒnˈdʒʊərə//
KK: /nɑnˈdʒʊrər/
A person, especially a clergyman, who refuses to take an oath of allegiance or loyalty, particularly to a government or ruler.
The nonjuror remained steadfast in his beliefs, refusing to swear loyalty to the new monarchy.
Nonjuror → It is formed from "non-" (meaning not) and "juror" (from Latin "jurare", meaning to swear). A nonjuror is someone who does not take an oath, particularly in a legal or religious context.
Think of someone who does not 'swear' ('jurare') an oath — 'non-' means not, so a nonjuror is someone who does not take an oath.