spektakulär
spectacular
Something that is very impressive, sensational, or dramatic and attracts a lot of attention.
Die Rettungsaktion des Bergsteigers war wirklich spektakulär.
The rescue operation for the mountain climber was truly spectacular.

spectacular
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spectacular
Something that is very impressive, sensational, or dramatic and attracts a lot of attention.
Die Rettungsaktion des Bergsteigers war wirklich spektakulär.
The rescue operation for the mountain climber was truly spectacular.

The adjective 'spektakulär' (spectacular) is closely related to the noun 'das Spektakel' (spectacle), which describes an impressive show or event. So something spectacular is like a spectacle.
Die Zirkusshow bot ein wahres Spektakel aus Licht und Musik.
The circus show offered a true spectacle of light and music.
'Spektakulär' (spectacular) can not only describe a noun, but can also be used as an adverb to modify a verb. It then describes the impressive way in which something happens.
Die Zahl der Anmeldungen ist spektakulär gestiegen.
The number of registrations has risen spectacularly.
This adjective is often used to describe visual impressions or extraordinary events. Common combinations are: a spectacular view, a spectacular sunset, or a spectacular success.
Vom Berggipfel hatten wir eine spektakuläre Aussicht auf das Tal.
From the mountain peak, we had a spectacular view of the valley.
noticeable / striking
'auffällig' and 'spektakulär' both have to do with attention. 'auffällig' means that something is easy to notice or stands out from its surroundings. This can also be something small, for example a bright jacket or unusual behavior. 'spektakulär' is much stronger: it describes something very impressive, dramatic, or sensational. Learners may confuse the words because both attract attention. But not everything that is 'auffällig' is spectacular. 'spektakulär' only fits when something really has a particularly strong effect or impresses many people.

Beim Sportfest hat du einen spektakulären Sprung gesehen.
At the sports festival, you saw a spectacular jump.
Heute ist ihre neue Brille besonders auffällig.
Today her new glasses are especially noticeable.