How to say "bastard" in Japanese

• 私生児しせいじCommon
  nounThe literal sense: a child born to parents who are not married, an illegitimate child or love child. It names the child and is not an insult, so it never renders 'you bastard!'.
• 野郎やろうCommon
  noun, pronounThe insult: derogatory slang, at home in rough male speech, for calling a man a bastard or son of a bitch — cursing someone who has angered or disgusted you, not the literal sense.
  先月せんげつの日直にっちょく当番とうばん全部ぜんぶ私に押し付おしつけた形かたちでエスケープした野郎やろうだ。↗

  He's the pest that, on last month's class-help day, escaped leaving me with all the work.

Use 私生児 for the literal sense, a child born to unmarried parents; use 野郎 only for the insult — derogatory slang for a man you are cursing — never for the literal sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 私生児しせいじillegitimate child
• くそたれshithead
• くそったれshithead
• めdamn
• 野郎やろうbastard
• 小倅こせがれpunk
• 尻穴けつめどasshole
• ちくしょうbrute