Let me change it again for you. You can think of it as unmeasurable. In dutch onmatig would work.
The one you'll find when you look it up is more like exmusty. Without obligation.
(In dutch that would be ontmoeten but oddly enough we allready use that for meet, it would suggest dismeet/unmeet but in this case the ont- is inchoative)
That's not exactly wrong but it is rather uncommon in written language outside poetry. Note that you have to capitalize the 'schone' here:
- 't Schone bord.
It is extremely common written.
But the thing is it is only common in unoffical writing, so you shouldn't use it when applying for a job or something. This being the age of a lot of written (typed) informal texts it's even more frequent. Cause how often did you used the write a letter or a story, definitely not daily let alone multiple times per day (which I think is common for a lot of people nowadays). It's used in books aswell, for stories that is, not really scientific books.
Not at all it is the normal modern meaning. Schoon meaning pretty is archaic and obsolete in dutch, noone would get what you mean. In the Netherlands I mean, it still has that meaning in Belgium (and ofcourse schön in Germany).
We still have the relict schoonheid though where is does mean beauty
No in StandardDutch it just means clean. In Flemish it still is the word for pretty though. (And Germany has schön. Dutch (in the Netherlands) abandoned that meaning centuries ago there is only a remnant in the word schoonheid (and a few fixed expressions). I couldn't pinpoint the exact moment but it must have been somewhere in Middle Dutch, I believe in Old Dutch we still used it for both definitions)