
rasend
rapid
Moving at very high speed; extremely fast.
Mit rasender Geschwindigkeit näherte sich der Krankenwagen.
The ambulance approached at rapid speed.
rapid / furious
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rapid
Moving at very high speed; extremely fast.
Mit rasender Geschwindigkeit näherte sich der Krankenwagen.
The ambulance approached at rapid speed.

furious
Expressing a feeling or quality to an extremely strong degree. Often used with negative emotions such as anger or jealousy.
Nach der Beleidigung wurde er rasend vor Wut.
After the insult, he became furious with anger.

tremendous
Colloquial for very great, huge, or extraordinary. Often used to describe success or popularity.
Der neue Song der Band hatte einen rasenden Erfolg in den Charts.
The band's new song had tremendous success in the charts.
'Rasend' is the present participle of the verb 'rasen' (to speed; to rage). As an adjective, it therefore describes something that happens with extreme speed or intensity.
Der Sturm fegte mit rasender Kraft über das Land.
The storm swept across the country with tremendous force.
The context shows the meaning: in connection with movement, 'rasend' means very fast. In connection with feelings or pain, it means extremely strong. In connection with success, it is colloquial for 'enormous'.
Das Auto fuhr in rasendem Tempo die Straße entlang.
The car drove down the road at a rapid pace.
To express an extreme feeling, the structure 'rasend vor + [noun in the dative]' is often used. Alternatively, it can also stand directly before an adjective.
Er war rasend vor Eifersucht.
He was furious with jealousy.
In the meaning 'very great' or 'enormous', 'rasend' is used mainly colloquially. Typical combinations are 'ein rasender Erfolg' (a tremendous success) or 'rasend beliebt sein' (to be extremely popular).
Sein erstes Buch hatte einen rasenden Erfolg.
His first book was a tremendous success.
angry
Both words can express very strong anger. Wütend directly describes the emotional state, while rasend emphasizes the extreme intensity particularly strongly. Use „wütend“ for ordinary intense anger and „rasend“ for a clearly heightened, fierce reaction.

Sie war rasend vor Wut, weil jemand ihr Auto absichtlich beschädigt hatte.
She was furious because someone had deliberately damaged her car.
Ich war wütend, weil mein Bruder ohne zu fragen mein Fahrrad genommen hatte.
I was angry because my brother had taken my bicycle without asking.