physically
The German word 'physisch' is used to describe something that is physical or tangible, rather than abstract or mental. It can be used as an adverb, as in 'Er arbeitet physisch hart' (He works physically hard), or as an adjective, as in 'Sie ist eine sehr physische Person' (She is a very physical person).
I work physically hard in the factory.
In this sentence, 'physisch' is used as an adverb to describe the intensity of the work being done in the factory.
This theory is not yet physically proven.
In this instance, 'physisch' is utilized as an adverb to convey that the evidence supporting the theory has not been substantiated in a physical or tangible manner.
Physically he is very strong, but emotionally very weak.
Here, 'physisch' is being used as an adjective to contrast the physical strength of the subject versus their emotional vulnerability.