This is the 9478th most frequent German word.
minder
"Less," "lower," or "inferior" in quality, degree, or amount.
Here, 'minder' is used as a prefix in 'minderwertig', which means 'inferior' or 'of lesser quality', to describe something with reduced value or quality.
Die Qualität des Materials ist minderwertig.
The quality of the material is inferior.
In this sentence, 'nicht minder' means 'no less', indicating that the level of talent is equal; it emphasizes the comparison in equality.
Johann ist nicht minder talentiert als seine Schwester.
Johann is no less talented than his sister.
'Minder' is used here to describe a lower degree of demand in comparison to something else or to a general expectation.