The Greek word μωροὶ (pronounced, moe-roi) is often translated as foolish or fool in other Bibles. However, μωροὶ is the root from which we derive the English word moron. But understand that the term moron, as used by Jesus and his Apostles, didn’t imply someone that is mentally challenged, as the medical term ‘moron’ does today. Rather, it meant someone that knows the difference between doing the right thing and the wrong thing, but doesn’t care to do what is right.
For example, the ten virgins of Jesus’ parable in Matthew 25 weren’t just ‘foolish’ girls, they were morons; they knew what they should do, but they didn’t care to do it.