For Marriage
It is bad; they are not at your level and are hiding something from you. Definitely abandon it.
For Business / Deal
It is bad. They are deceiving you, and as a result, you will suffer a loss. Definitely abandon it.
فَلَمَّا ذَهَبُوا بِهِ وَأَجْمَعُوا أَن يَجْعَلُوهُ فِي غَيَابَتِ الْجُبِّ ۚ وَأَوْحَيْنَا إِلَيْهِ لَتُنَبِّئَنَّهُم بِأَمْرِهِمْ هَٰذَا وَهُمْ لَا يَشْعُرُونَ
Falamma thahaboo bihi waajmaAAoo an yajAAaloohu fee ghayabati aljubbi waawhayna ilayhi latunabiannahum biamrihim hatha wahum la yashAAuroona
So they did take him away, and they all agreed to throw him down to the bottom of the well: and We put into his heart (this Message): 'Of a surety thou shalt (one day) tell them the truth of this their affair while they know (thee) not'
