What is Expressiveness in a Computer Language

[Joachim Durchholz]

Anton van Straaten schrieb:
>> It seems we have languages:
>> with or without static analysis
>> with or without runtime type information (RTTI or "tags")
>> with or without (runtime) safety
>> with or without explicit type annotations
>> with or without type inference
>>
>> Wow. And I don't think that's a complete list, either.
> 
> Yup.

What else?
(Genuinely curious.)

Regards,
Jo