推測

1. Origins, structure, and basic meaning

• Structure: 推測, read すいそく, is an inference or estimate drawn about something not directly known.
• Basic usage: 足跡から大きさを推測した infers size from evidence; 根拠のない推測だけ warns against unsupported inference.

2. Common pitfalls and similar expressions

• Evidence-based estimate and unsupported guess
  • から supplies an observable basis in the first context, while 根拠のない explicitly removes that support in the second.