This is the 14967th most frequent German word.
schlampigen
Messy, sloppy, or untidy.
Here, 'schlampigen' is used as an adjective describing the notes, with the meaning 'messy' or 'carelessly made'.
Die schlampigen Notizen des Studenten waren schwer zu lesen.
The student's messy notes were hard to read.
In this sentence, 'schlampigen' characterizes the works as being done in a careless or untidy manner.
Die schlampigen Arbeiten wurden von dem Lehrer kritisiert.
The sloppy works were criticized by the teacher.
Here, 'schlampigen' is applied to 'Verhalten', indicating behavior that is not well-prepared or is unprofessional.