conceal

1. Origins, structure, and basic meaning

• Structure: 匿 conveys concealment; its on-reading is とく.
• Basic usage: 匿名 refers to not revealing a name, while 匿名性 names the quality of anonymity.

2. Common pitfalls and similar expressions

• で and の
  • 匿名で回答する describes answering anonymously, while 匿名の寄付者 identifies a donor whose name is not disclosed.
• 性 marks a quality
  • The 性 in 匿名性 indicates a quality. The word describes the anonymity of a service or setting rather than an individual action performed anonymously.