wild guess

Noun

A guess that is not based on any evidence, knowledge, or experience.

Japanese Meaning

根拠や証拠に基づかない推測 / 当てずっぽうな推察

If I had to make a wild guess, I'd say the package will arrive by Friday.

あえて根拠のない推測をすると、その荷物は金曜日までに届くと思います。

Sense（1）

A guess that is not based on any evidence, knowledge, or experience.

wild guesses

（ plural ）