This is the 14380th most frequent German word.
irrsinnig
"Extremely crazy" or "insanely."
In this sentence, 'irrsinnig' is used as an adverb to intensify the adjective 'schön', conveying an extreme degree.
Die Landschaft war irrsinnig schön.
The scenery was insanely beautiful.
Here, 'irrsinnig' acts as an adjective to describe 'Verhalten', indicating irrationality or extremeness.
Sein Verhalten war einfach irrsinnig.
His behavior was just insane.
In this structure, 'irrsinnigem' modifies the noun 'Einsatz', emphasizing the extraordinary effort involved.