There are many ways to say foolish since this can be a term of colloquial use, each region shows different words or names. In some cases, words that are more aggressive and that can certainly be hard for sensitive people can be used instead.
But speaking of the concept in itself, we can say that the fool is the one who shows a relative difficulty to manage activities or common situations. For example, it can be considered silly to a person who does not know how to handle certain appliances, having difficulties to interact socially, etc. Many times, the silly Word also applies to people without any disability who make a mistake circumstantial, for example losing any item or money.
When you talk about more serious cases where it shows a clear incapacity to manage independently e.g. to dress up, go out, to buy or to handle also can speak that the person is stupid, but possibly in these cases will tend to make mention of the inability of the individual-specific condition as as mentioned, the silly term is colloquial use and does not striking or serious complications.
Article contributed by the team of collaborators.