
hässlich
ugly
Visually unattractive; unpleasant in appearance.
Er fand das moderne Gebäude aus Glas und Stahl einfach nur hässlich.
He found the modern building made of glass and steel simply ugly.
ugly
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ugly
Visually unattractive; unpleasant in appearance.
Er fand das moderne Gebäude aus Glas und Stahl einfach nur hässlich.
He found the modern building made of glass and steel simply ugly.

ugly
Morally or personally repulsive; mean, malicious, or unfair.
Das war eine wirklich hässliche Bemerkung über seine Kollegin.
That was a really ugly remark about his colleague.

ugly
Describing a situation or event as very unpleasant, difficult, or threatening.
Nach der Trennung gab es einen hässlichen Streit um das Sorgerecht.
After the separation, there was an ugly dispute over custody.
'Hässlich' (ugly) describes not only appearance, but also mean or unfair behavior. The context (e.g., words, actions, character) makes it clear that a moral judgment is meant.
Es war hässlich von ihm, das Gerücht zu verbreiten.
It was ugly of him to spread the rumor.
The word is also used to describe very unpleasant or threatening situations. Typical combinations are 'ein hässlicher Streit' (an ugly dispute) or 'eine hässliche Szene' (an ugly scene).
Die Scheidung entwickelte sich zu einer hässlichen Schlammschlacht.
The divorce developed into an ugly mudslinging match.
'Hässlich' (ugly) can be used as an adverb to describe an action. It then means 'in a mean/unfair way.'
Sie hat sich ihm gegenüber wirklich hässlich benommen.
She really behaved uglily toward him.
mean / common
Gemein describes behavior more specifically as malicious, unfair, or deliberately hurtful. Hässlich can judge the same behavior more generally as morally repulsive. Gemein is therefore especially fitting for a deliberate act of causing hurt; hässlich places more emphasis on moral disgust at it.

Sein hässlicher Angriff auf die Kollegin stieß alle anderen ab.
His ugly attack on his colleague disgusted everyone else.
Sein gemeiner Angriff sollte die Kollegin vor allen anderen verletzen.
His mean attack was intended to hurt his colleague in front of everyone else.