derart
so / such
An adverb used to emphasize a high degree or extreme extent of something; in such a way, to such an extent.
Der Sturm war derart stark, dass mehrere Bäume umstürzten.
The storm was so strong that several trees fell over.

so / such
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so / such
An adverb used to emphasize a high degree or extreme extent of something; in such a way, to such an extent.
Der Sturm war derart stark, dass mehrere Bäume umstürzten.
The storm was so strong that several trees fell over.

'Derart' (so / such) is composed of 'der' and 'Art' (kind/type). It literally means 'of this kind' or 'in this way' and expresses a high degree.
Eine derartige Unfreundlichkeit habe ich noch nie erlebt.
I have never experienced such unfriendliness before.
Very often, 'derart' (so / such) introduces a consecutive clause that begins with 'dass' (that). The structure is: 'derart + adjective/adverb, dass ...' (so + adjective/adverb that ...).
Er war derart müde, dass er sofort einschlief.
He was so tired that he fell asleep immediately.
'Derart' (so / such) belongs more to written language or a more formal style. In everyday spoken language, the simpler word 'so' (so) is usually used.
Die Preise sind derart gestiegen, dass sich viele Menschen das Heizen kaum noch leisten können.
Prices have risen so much that many people can hardly afford heating anymore.
very
'sehr' and 'derart' can both express a high degree. 'sehr' is neutral and completely normal in everyday language. 'derart' sounds stronger and somewhat more formal. It often appears in sentences where a consequence is then stated, for example with 'dass' (that). Learners may confuse the words because both intensify. Practically speaking: for normal statements, 'sehr' usually sounds more natural; 'derart' is used when you want to emphasize a particularly strong effect or an extreme degree.

Mein Kollege war derart nervös, dass er seine Notizen vergessen hat.
My colleague was so nervous that he forgot his notes.
Meine Schwester ist sehr müde, weil sie früh zum Bahnhof musste.
My sister is very tired because she had to go to the station early.