Μόλις είπα μια μεγάλη βλακεία.

English Translation

I just said a very stupid thing.

The sentence “Μόλις είπα μια μεγάλη βλακεία.” translates to “I just said a big stupidity.” or more naturally in English, “I just said something really stupid.”

English Translation

I just said a very stupid thing.

βλακεία (vlakeía) - This noun means “stupidity” or “nonsense.” It is a feminine singular noun.

English Translation

I just said a very stupid thing.

Collins dictionary translates the noun βλακεία to mean “stupid thing to say” so the original translation could be considered correct.