This is the 15012th most frequent German word.
schädliche
Harmful.
Here, 'schädliche' is used as an adjective to describe 'Wirkung', indicating detrimental effects.
Der Chemiker untersucht die schädliche Wirkung von Giftstoffen auf die Umwelt.
The chemist studies the harmful effects of toxins on the environment.
In this sentence, 'schädliche' directly qualifies 'Substanzen', emphasizing the undesirable nature of the substances.
Schädliche Substanzen sollten nicht ins Trinkwasser gelangen.
Harmful substances should not enter drinking water.
Here, 'schädlichen' appears in a genitive construction modifying 'Eigenschaften', showing possessiveness over harmful characteristics.