当あてずっぽう

noun

random guess; guesswork; shot in the dark

A guess made without solid evidence; often used when someone is just taking a wild stab at something. Can be used as a noun or with する to mean 'to make a wild guess'.

• 彼かれの答こたえは当あてずっぽうだったが、たまたま正せい解かいだった。

  His answer was a shot in the dark, but it happened to be correct.

• 当あてずっぽうで答こたえるより、少すこし考かんがえたほうがいい。

  Instead of answering with a wild guess, you should think a little.