This is the 15043rd most frequent German word.
seriös
Respectable, trustworthy, or reliable.
Here, 'seriös' is used to describe someone's professionalism and reliability.
Er gilt als ein seriöser Geschäftsmann.
He is considered a reputable businessman.
In this context, 'seriös' implies that the offer appeared trustworthy or credible.
Das Angebot klang seriös, aber wir überprüften es trotzdem.
The offer sounded genuine, but we verified it nonetheless.
Here, 'seriös' refers to the thoroughness and reliability of the research.