negative regulation of NAD+ ADP-ribosyltransferase activity
Known as: down regulation of poly(ADP-ribose) synthase activity, down-regulation of NAD+ ADP-ribosyltransferase activity, inhibition of ADP-ribosyltransferase (polymerizing) activity
Any process that stops, prevents or reduces the frequency, rate or extent of NAD+ ADP-ribosyltransferase activity. [GOC:BHF, GOC:TermGenie]