Scala. Expressive, concise, can scale from simple to sophisticated. Sufficiently powerful - has metaprogramming, advanced types. Runs on a world-class runtime and takes advantage of a huge, mature package ecosystem that isn’t going anywhere.
“Sufficiently powerful” is a bit of an understatement when it comes to Scala. Honestly may have a bit too many features for my taste, it’s not a small language
Actually the language is quite small. The features, it has, are just quite powerful and have huge synergies so that it seems that you have a lot of complex features. It has a lot of weird corner case stuff, but most of that is because of the jvm and other languages have that too unfortunately.