schwachem
Schwachem is a German adjective form derived from schwach. It is not a separate word but a grammatical ending used in the inflection of adjectives. In German, adjectives change their endings to reflect the case, gender, number of the noun they modify, and whether a determiner is present. Schwachem specifically appears in the dative singular for masculine and neuter nouns when the adjective is in the strong (unmarked) declension, i.e., when no determiner precedes the noun.
In practice, schwachem occurs for masculine and neuter nouns in the dative singular. Examples include schwachem
A fuller pattern shows that schwachem is part of the strong declension endings for dative singular masculine