wrongdoer; person in the wrong; malfeasant
Refers to someone who has committed an improper or illegal act; often used in formal or legal contexts.
Wrongdoers should be severely punished.
The investigation revealed that he was the person in the wrong.
加害者 means 'perpetrator' or 'offender' in the context of causing harm, often used in legal or victim-related contexts. 不正者 focuses more on the wrongdoing itself rather than the harm caused.
Compound of 不正 (fusei, 'injustice, wrongdoing') and 者 (sha, 'person'). The exact historical derivation is uncertain, but the word follows a common pattern for forming agent nouns.