In the dictionary
paradoxical adjective (of a person, thing or situation) having two opposite features and therefore seeming strange
It is paradoxical that some of the poorest people live in some of the richest areas of the country.
Do we have a common word, which a child can understand, expressing "paradoxical" in everyday English?
For example, It is odd/weird/strange... that some of the poorest people live in some of the richest areas of the country.
But "odd/weird/strange..." don't express 2 opposite features.