unfavorable / unflattering
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unfavorable
Having a disadvantageous effect or taking place at an unsuitable time. It describes circumstances that make a plan more difficult or make a bad result likely.
Der Termin für die Besprechung ist für mich sehr ungünstig.
The time for the meeting is very unfavorable for me.
The word is the opposite of 'günstig' (favorable, suitable). The prefix 'un-' is used here to express negation, similar to 'unwichtig' (unimportant) or 'unmöglich' (impossible).
Ein günstiger Wind half dem Segelboot, schnell voranzukommen.
A favorable wind helped the sailboat move forward quickly.
In the meaning 'unpassend' (unsuitable), 'ungünstig' (unfavorable) is often combined with times or circumstances. Typical nouns are 'Zeitpunkt' (point in time), 'Moment' (moment), 'Termin' (appointment/time), 'Wetter' (weather), or 'Bedingungen' (conditions).
Wegen der ungünstigen Wettervorhersage wurde das Picknick abgesagt.
Because of the unfavorable weather forecast, the picnic was canceled.
To express for whom something is 'ungünstig' (unfavorable), the preposition 'für' is used with the accusative. This pattern is very common.
Ein Treffen um 8 Uhr morgens ist für mich leider ungünstig.
A meeting at 8 a.m. is unfortunately unfavorable for me.
When it is about a bad impression, 'ungünstig' (unflattering) often refers to visual aspects. Common combinations are 'ungünstiges Licht' (unflattering light), 'ungünstiges Foto' (unflattering photo), or 'ein ungünstiger Winkel' (an unflattering angle).
Dieses Foto ist sehr ungünstig, es zeigt nur meine schlechte Seite.
This photo is very unflattering; it only shows my bad side.
bad
'schlecht' and 'ungünstig' can both describe that something is not good for a situation. 'schlecht' is more general and fits many things, for example weather, quality, or conditions. 'ungünstig' is used more specifically when circumstances make a goal harder to achieve or when the timing is not suitable. It often sounds a bit more objective. For example, you say 'schlechtes Wetter' (bad weather), but 'ein ungünstiger Zeitpunkt' (an unfavorable time) sounds more natural when an appointment causes problems.
Der Termin ist ungünstig, weil die Gruppe direkt nach der Arbeit noch müde ist.
The appointment time is unfavorable because the group is still tired right after work.
Heute ist das Licht im Flur schlecht, deshalb sehe ich die Stufen kaum.
The light in the hallway is bad today, so I can hardly see the steps.