This is the 15649th most frequent German word.
wüster
"Wüster" is the comparative form of "wüst," meaning "more desolate," "more wild," or "more chaotic."
Here, 'wüster' is used as an adjective to describe the storm as being chaotic or turbulent.
Das war ein wüster Sturm, der große Schäden angerichtet hat.
That was a wild storm that caused great damage.
In this case, 'wüster' is used to characterize hatred as being intense and fervent, giving it a wild quality.
Sein wüster Hass gegen die Ungerechtigkeit trieb ihn zum Handeln.
His intense hatred against the injustice drove him to act.
Here, 'wüster' is used to describe the temple as being in a ruined or desolate state.