This is the 14905th most frequent German word.
riesiger
"Riesiger" means "gigantic" or "huge."
Here, 'riesiger' acts as an attributive adjective giving a descriptive quality to 'Baum' (tree), indicating its large size.
Ein riesiger Baum steht in der Mitte des Parks.
A giant tree stands in the middle of the park.
In this sentence, 'riesiger' is used as an attributive adjective describing the noun 'Vertreter' (representative), modifying it to convey the notion of largeness or immensity.
Der Elefant ist ein riesiger Vertreter seiner Art.
The elephant is a huge representative of its species.
In this example, 'riesigen' is used as an attributive adjective describing 'Spaß' (fun), emphasizing the extent or intensity of the enjoyment.