der Barbar
barbarian
A person who is regarded as uncivilized, crude, cruel, or uncultured.
Nur ein Barbar zerstört mutwillig Kunstwerke.
Only a barbarian deliberately destroys works of art.

barbarian
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barbarian
A person who is regarded as uncivilized, crude, cruel, or uncultured.
Nur ein Barbar zerstört mutwillig Kunstwerke.
Only a barbarian deliberately destroys works of art.

'Der Barbar' (the barbarian) belongs to the N-declension. This means it takes the ending '-en' in all cases except the nominative singular.
Die Geschichte handelt von einem Kampf gegen einen Barbaren.
The story is about a fight against a barbarian.
The noun 'der Barbar' (the barbarian) is closely related to the adjective 'barbarisch' (barbaric), which means 'uncivilized,' 'cruel,' or 'crude.'
Die Zerstörung der alten Statuen war ein barbarischer Akt.
The destruction of the ancient statues was a barbaric act.
In modern usage, 'Barbar' (barbarian) is a very strong, derogatory term for a person. It is not a neutral description, but a harsh insult.
Er nannte die lauten Fußballfans Barbaren.
He called the loud football fans barbarians.
You can recognize the historical meaning from the context. If it is about antiquity, the Roman Empire, or ancient peoples, the neutral, historical meaning is intended.
Für die Griechen war jeder ein Barbar, der kein Griechisch sprach.
For the Greeks, anyone who did not speak Greek was a barbarian.
animal
'das Tier' and 'der Barbar' can both be used derogatorily for a person who behaves in a crude, brutal, or inconsiderate way. 'Tier' especially emphasizes wild or brutal behavior, as if someone is not acting human. 'Barbar' sounds more strongly like uncivilized, cruel, or uncultured. The word fits better when someone grossly disregards rules, people, or culture. 'Tier' is more direct in everyday language and can be very insulting; 'Barbar' often sounds somewhat more figurative or dramatic.

Wer absichtlich alte Kunstwerke zerstört, handelt wie ein Barbar.
Anyone who deliberately destroys old works of art is acting like a barbarian.
Nach dem Angriff nannten einige Leute den Täter ein Tier.
After the attack, some people called the perpetrator an animal.