genial
brilliant
Exceptionally creative, intelligent, or inventive; showing outstanding intellectual talent.
Er hatte eine geniale Idee, um das Problem zu lösen.
He had a brilliant idea for solving the problem.

brilliant / awesome
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brilliant
Exceptionally creative, intelligent, or inventive; showing outstanding intellectual talent.
Er hatte eine geniale Idee, um das Problem zu lösen.
He had a brilliant idea for solving the problem.

Careful: 'genial' in German means 'brilliant' or 'showing genius.' It is a false friend of the English word 'genial,' which means 'friendly and cheerful.'
Albert Einstein war ein genialer Physiker.
Albert Einstein was a brilliant physicist.
'Genial' (brilliant/awesome) belongs to the word family of 'das Genie' (a person with exceptional talent; genius) and 'die Genialität' (the quality of being brilliant/genius).
Nur ein Genie konnte dieses komplexe Rätsel lösen.
Only a genius could solve this complex puzzle.
The word has two stylistic levels. The original meaning is 'brilliant' and describes ideas or people. Colloquially, however, it is also often used today as a synonym for 'super' or 'fantastic' when talking about experiences.
Das ist eine geniale Erfindung, die vielen Menschen helfen wird.
That is a brilliant invention that will help many people.
super
'super' and 'genial' can both express a very positive evaluation. 'super' is very general and fits many everyday things: a meal, a plan, a day, or an idea. Colloquially, 'genial' can also simply mean 'very good', but it often has a stronger sound. It fits especially well when something is particularly clever, creative, or surprisingly good. For normal positive reactions, 'super' is often more neutral; 'genial' feels stronger and more enthusiastic.

Herr Hofmann hat eine geniale Idee für mehr Sicherheit im Büro.
Mr. Hofmann has a brilliant idea for improving safety in the office.
Das Essen war super, weil alles frisch gekocht war.
The food was super because everything was freshly cooked.