This is the 13112th most frequent German word.
andauernde
"Lasting" or "ongoing."
Here, 'andauernde' is used as an adjective to describe the quality of 'Stille' (silence), implying that the silence persisted over time, denoting continuity.
Die andauernde Stille in dem Raum war bemerkenswert.
The continuous silence in the room was remarkable.
In this sentence, 'andauernde' modifies 'Bemühung' (effort), signifying that the effort was sustained or ongoing over a period of time.
Seine andauernde Bemühung führte schließlich zum Erfolg.
His ongoing effort eventually led to success.
Here, 'andauernde' describes 'Regen' (rain), indicating that the rain continued uninterrupted, emphasizing its duration.