Callaham's gives this as an option. I can see why you avoided
synonyms of "nonsense". Like postmodernism, it means something
to these people (if only something different to each one!)

.

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Note added at 8 mins (2006-11-16 22:20:30 GMT)
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And in the middle of the room stood table, on which, besides printed volumes, were strewn manuscript sermons, historical tracts, and political pamphlets, all written in such a queer, blind, **crabbed, fantastical hand, that a writing-master would have gone raving mad at the sight of them.
Grandfather's Chair by Hawthorne, Nathaniel

Language that is unintelligible or unfamiliar.

There have also been accounts of twins who spoke an unintelligible language only their sibling understood.

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Note added at 9 mins (2006-11-16 22:21:05 GMT)
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And I was thinking about goobledygook before answering this question
...

just an option

This is not exactly "заумный" but close. I'd use that if in need of a one-word qualifier.



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Note added at 34 mins (2006-11-16 22:45:55 GMT)
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Scratch "pretentious".

How about "intricate"? This is much closer and to my eye carries the right overtones.

Последний вариант только что слышала в отношении одного профессора, который чересчур философствовал при объяснении различных теорий...

recondite language

The prime issue surrounding recondite language is not whether one can find every word in the Oxford English Dictionary, but whether such a language ...
links.jstor.org/ sici?sici=0362-6784(198823)18%3A3%3C313%3ANLBRDV%3E2.0.CO%3B2-L - Похожие страницы

Помимо прямого значения, описанного ниже, применяется и фигурально. Во всяком случае, наши насовцы нередко так называют свой профессиональный жаргон или документы, где штук 8 аббревиатур, соединенных парой предлогов, составляют законченное предложение.

http://www.philipcoppens.com/birdlanguage.html

Tweet tweet: the language of birds

The “bird language” or “Green language” is an intriguing system of codes, practiced by some traditions. But what lies at its origins – and could its origin actually not be a language, but what many termed the original method of communication?
The “language of birds” has many names; some call it the “Language of the Gods”, others the “Green language”. Michael Sells has referred to this “sacred language” as the “language of unsaying”, whereby the core of what needs to be said, is actually not said, though everyone understands what is being said.
The “language of birds” is therefore the mystical language, by default an unpopular subject amongst scholars, specifically because of the apparent lack of “clarity”: a clear and distinct sense.

This is that highfalutin language that turns off a lot of readers to reading a great deal of poetry written before the twentieth century. ...
articles.poetryx.com/45/

Ссылок в Сети очень много.

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Note added at 6 hrs (2006-11-17 04:34:54 GMT)
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Why not just "futuristic language"?
Or adding something, like "fanciful futuristic language"...


... but three songs are writen in an invented language called Loxian , described by Enya and Roma Ryan as " a futuristic language from a distant planet . ...
www.search.com/reference/Enya