deficient / inadequate
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deficient
Not meeting the expected or required standards; faulty, incomplete, or of poor quality.
Die Verarbeitung des Geräts war mangelhaft, deshalb habe ich es zurückgeschickt.
The workmanship of the device was deficient, so I sent it back.
insufficient
A school grade in the German grading system that corresponds to a five and evaluates performance that does not meet the requirements, but shows that basic knowledge is present.
Für seine Leistung im Diktat erhielt er die Note „mangelhaft“.
For his performance in the dictation, he received the grade "insufficient".
The adjective is derived from the noun 'der Mangel' (lack or defect) and the ending '-haft'. Something that is 'mangelhaft' (deficient) therefore has a defect or flaw.
Aufgrund mangelhafter Beweise wurde der Angeklagte freigesprochen.
Due to insufficient evidence, the defendant was acquitted.
In the context of school, grades, or report cards, 'mangelhaft' (insufficient) is a fixed term. It refers to the school grade 5 and means that the performance was not sufficient.
Er hat in der letzten Prüfung leider nur ein „mangelhaft“ bekommen.
Unfortunately, he only got an "insufficient" on the last exam.
In its general meaning, 'mangelhaft' (deficient) often describes the quality of products, services, or knowledge. Typical combinations are 'mangelhafte Ware' (defective goods), 'mangelhafte Hygiene' (poor hygiene), or 'mangelhafte Sprachkenntnisse' (insufficient language skills).
Die mangelhafte Organisation führte zu großen Verzögerungen.
The deficient organization led to major delays.
bad
Schlecht and mangelhaft can both be used to assess work that does not meet the requirements. Schlecht is a general assessment of quality. Mangelhaft sounds more formal and emphasizes that specific errors or missing parts are present.
Im Prüfbericht wird dieselbe Dokumentation wegen fehlender Angaben als mangelhaft bewertet.
In the inspection report, the same documentation is rated as deficient because information is missing.
Meine Kollegin findet die Dokumentation schlecht, weil wichtige Angaben fehlen.
My colleague thinks the documentation is bad because important information is missing.
