Also means
physical lethargy; inertia (physics)
Usage Note
Trägheit in a cognitive sense describes the mental resistance to effort, change, or new ideas — geistige Trägheit (mental lethargy). In physics it means inertia, so context usually clarifies the intended sense.
Examples
"Geistige Trägheit ist oft ein Zeichen für mangelnde Herausforderung."
Natural Translation
Mental inertia is often a sign of insufficient challenge.
Literal Translation
Mental sluggishness is often a sign for lacking challenge.

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