noun
wrongdoer; person in the wrong; malfeasant
Refers to someone who has committed an improper or illegal act; often used in formal or legal contexts.
不正者は厳しく処罰されるべきだ。
Wrongdoers should be severely punished.
調査の結果、彼が不正者であることが判明した。
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.