unschädlich
harmless
Being such that it causes no damage, injury, or negative effects; harmless.
Die meisten Hausspinnen sind für den Menschen völlig unschädlich.
Most house spiders are completely harmless to humans.

harmless
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harmless
Being such that it causes no damage, injury, or negative effects; harmless.
Die meisten Hausspinnen sind für den Menschen völlig unschädlich.
Most house spiders are completely harmless to humans.

The word has a simple structure: it consists of the prefix 'un-' (not) and the adjective 'schädlich' (harmful). So it literally means 'nicht schädlich' (not harmful).
Der verwendete Farbstoff ist für die Gesundheit völlig unschädlich.
The dye used is completely harmless to health.
The expression 'jemanden oder etwas unschädlich machen' (to render someone or something harmless) is very common. It means to neutralize or disable a danger or a threat.
Dem Bombenentschärfungsteam gelang es, den Sprengsatz unschädlich zu machen.
The bomb disposal team managed to render the explosive device harmless.
In its basic meaning, 'unschädlich' (harmless) is often used for substances, products, or small living creatures. Typical combinations are 'unschädliche Inhaltsstoffe' (harmless ingredients), 'unschädliche Chemikalien' (harmless chemicals), or 'unschädliche Spinnen' (harmless spiders).
Dieses Insektenspray ist für Pflanzen unschädlich.
This insect spray is harmless to plants.
dangerous
'gefährlich' and 'unschädlich' are direct opposites when it comes to possible harm. You use 'gefährlich' when something can injure someone, make someone ill, or have other negative consequences. 'unschädlich' means that something causes no harm and is therefore harmless. 'gefährlich' is typical for risks such as fire, poison, or traffic. 'unschädlich' fits well with substances, minor injuries, or things that have been checked and do not pose a danger.

Der Arzt sagt, dass der kleine Fleck auf der Haut unschädlich ist.
The doctor says that the small spot on the skin is harmless.
Die Polizei sperrt den Weg, weil der alte Baum gefährlich ist.
The police block off the path because the old tree is dangerous.