怪しい

1. Origins, structure, and basic meaning

• Structure: 怪しい is read as あやしい and is an い-adjective describing a person or action as suspicious or a phenomenon as strange and questionable.
• Basic usage: Suspecting a person appears in その人を怪しいと思う, while a strange phenomenon appears in 森の奥の怪しい光.

2. Common pitfalls and similar expressions

• Suspicion and strangeness
  • With people or actions it suggests distrust, while with a light, sound, or phenomenon it suggests something odd whose nature is unknown.
• Difference from 不思議
  • 不思議 expresses puzzling or wondrous strangeness, while 怪しい more readily carries unease about danger, deception, or unreliability.