[cwp]

Lisp and Forth are the extreme case, which is especially bad, because you get no error message at all.

But the middle ground are languages that can detect a syntax error, but can't figure out exactly what it is. You don't get an error message saying "You should have a semi-colon here, want me to insert one?" Instead you get some vague message like "didn't expect this keyword here" a few lines after the missing semi-colon.