"Der ist nett, nicht?" would mean "He/This guy is nice/friendly, isn't he?" "Der ist nicht nett" (different grammar) would mean "He/this guy isn't nice/friendly".
Sie ist nett aber ein bißchen gemein
You are nice. = Du bist nett.
Du bist unsympathisch.orDu bist nicht nett
If you wanna know how to say you were so cute in German its sie warren so nett hope this helps
It is "they are not nice".
Nice to meet you
Ich will Sie, nett zu seinMeans i want you to be nice
This term indicates that the seller expects you to pay within 7 days, and the nett part means that there is no discount.
Nett Monthly Account - Payment due on last day of the month following the one in which the invoice is dated
du bist süß weil du nett bist
That's a nice name = Das ist ein schöner Name