nice
A colloquial word borrowed from English that is used as a generally positive evaluation meaning 'good', 'beautiful', 'pleasant', or 'cool'.
Wow, das ist ein echt nices Fahrrad!
Wow, that's a really nice bike!

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A colloquial word borrowed from English that is used as a generally positive evaluation meaning 'good', 'beautiful', 'pleasant', or 'cool'.
Wow, das ist ein echt nices Fahrrad!
Wow, that's a really nice bike!

The word 'nice' is a very informal Anglicism used especially in youth slang. It should be avoided in formal or professional contexts.
Wir hatten gestern einen echt nicen Abend im Kino.
We had a really nice evening at the cinema yesterday.
As an English loanword, 'nice' is often not declined, even when it comes before a noun. The form 'ein nice Pullover' is just as common in colloquial speech as the declined form 'ein nicer Pullover' (a nice sweater).
Sie hat sich ein richtig nice T-Shirt gekauft.
She bought herself a really nice T-shirt.
To strengthen the positive meaning, 'nice' is often combined with colloquial adverbs such as 'echt' (really), 'voll' (totally), or 'richtig' (really).
Deine neue Frisur ist voll nice!
Your new hairstyle is totally nice!
good
'gut' and 'nice' can both evaluate something positively. 'gut' is the normal German word and fits in almost all situations, including school, work, or formal conversations. 'nice' comes from English and is used colloquially in German. It sounds casual, modern, and often somewhat youthful. 'nice' is more suitable for spontaneous reactions, experiences, or things that you find pleasant or cool. If the style should be neutral, 'gut' is the better choice.

Die Aussicht vom Hotel war richtig nice.
The view from the hotel was really nice.
Der neue Supermarkt in der Nachbarschaft ist wirklich gut.
The new supermarket in the neighborhood is really good.