架空

1. Origins, structure, and basic meaning

• Structure: It is read かくう. In this entry, the word describes something invented or imagined rather than actually existing. It commonly modifies a noun in the form 架空の.
• Basic usage: It is used for fictional settings or nonexistent details such as an address. The example places a novel on an imagined island.
  • 小説の舞台は、海に浮かぶ架空の島だ。

2. Common pitfalls and similar expressions

• Fictional settings versus false information
  • 架空の島 can be a fictional setting, while 架空の住所 can be false information supplied in place of a real address. Both are nonexistent, but whether deception is involved depends on the context.