mediocre
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mediocre
Of average but not especially good quality; neither good nor bad, often with a slightly negative tendency.
Der Service im Restaurant war leider nur mittelmäßig.
Unfortunately, the service in the restaurant was only mediocre.
The word consists of 'Mittel' (middle/medium) and the suffix '-mäßig' (-like/-wise). It literally means 'corresponding to the measure of the middle' and describes something that is in the middle in terms of quality.
Seine Leistung in der Prüfung war nur mittelmäßig.
His performance in the exam was only mediocre.
Although 'mittelmäßig' (mediocre) means average, it usually has a slightly negative meaning. It often expresses that something did not meet expectations and was not especially good.
Der Film war nicht schlecht, aber eben nur mittelmäßig.
The film wasn't bad, but it was really just mediocre.
The adjective is often used to evaluate the quality of performances, results, or products. Typical phrases are 'eine mittelmäßige Leistung' (a mediocre performance), 'ein mittelmäßiges Ergebnis' (a mediocre result), or 'ein mittelmäßiges Essen' (a mediocre meal).
Mit einem mittelmäßigen Zeugnis wird es schwer, einen Studienplatz zu finden.
With a mediocre report card, it will be difficult to find a place at university.
bad
'schlecht' and 'mittelmäßig' both describe an evaluation, but they are on different levels. 'schlecht' is clearly negative: something is of low quality or does not work well. 'mittelmäßig' means more like average: it is not really good, but also not completely bad. So the contrast is between clearly bad and only moderately good. If you want to criticize something clearly, 'schlecht' fits better. If something simply is not especially convincing, 'mittelmäßig' is more precise.
Das Essen im Hotel war mittelmäßig, aber für eine Nacht in Ordnung.
The food at the hotel was mediocre, but fine for one night.
Der Film war schlecht, weil die Geschichte langweilig und unlogisch war.
The movie was bad because the story was boring and illogical.