
wahnsinnig
extremely
Colloquially used as an adverb for emphasis: very, extremely, incredibly.
Das Essen in diesem Restaurant ist wahnsinnig lecker.
The food in this restaurant is extremely delicious.
extremely / insane
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extremely
Colloquially used as an adverb for emphasis: very, extremely, incredibly.
Das Essen in diesem Restaurant ist wahnsinnig lecker.
The food in this restaurant is extremely delicious.

insane
Completely unreasonable, absurd, or crazy.
Es ist eine wahnsinnige Idee, bei diesem Wetter in den Bergen zu wandern.
It's an insane idea to hike in the mountains in this weather.

insane
In a state of madness; severely mentally ill. This meaning is less common today and is more formal or literary.
Die ständige Folter machte den Gefangenen wahnsinnig.
The constant torture drove the prisoner insane.
The word is made up of 'Wahn' (a false, irrational idea) and 'Sinn' (sense/mind). 'Wahnsinnig' (insane/extremely) originally describes a state in which the mind or senses are clouded.
Der Lärm in der Fabrik war so laut, er machte einen fast wahnsinnig.
The noise in the factory was so loud it almost drove you insane.
In colloquial language, 'wahnsinnig' (extremely) is very often used as an adverb to intensify an adjective or verb. It then simply means 'very' or 'extremely'.
Ich habe mich wahnsinnig über das Geschenk gefreut.
I was extremely happy about the gift.
When 'wahnsinnig' (insane) describes a noun, it means 'crazy' or 'absurd'. Typical combinations are 'eine wahnsinnige Idee' (an insane idea), 'ein wahnsinniger Plan' (an insane plan), or 'ein wahnsinniges Glück' (incredible luck).
Er hatte wahnsinniges Glück, dass er den Zug noch erwischt hat.
He was incredibly lucky to still catch the train.
The original meaning 'psychically ill/mentally ill' is hardly used in everyday language today. You find it mainly in older literature or in a very formal, medical context.
In der Novelle wird die Hauptfigur langsam wahnsinnig.
In the novella, the main character slowly goes insane.
damn / damned
“Verdammt” and “wahnsinnig” can both strongly intensify a quality. “Wahnsinnig” sounds like a colloquial exaggeration, while “verdammt” also has a coarse, curse-like tone. In a less vulgar statement, “wahnsinnig” is therefore more suitable.

Das Essen hier ist wahnsinnig lecker.
The food here is incredibly delicious.
Das Essen hier ist verdammt lecker.
The food here is damn delicious.