. "Any process that stops, prevents, or reduces the frequency, rate or extent of CDK activity." . . . . "CDK inhibitor" . "cyclin-dependent kinase inhibitor" . "negative regulation of cyclin-dependent protein kinase activity" . "down regulation of cyclin-dependent protein kinase activity" . "down-regulation of cyclin-dependent protein kinase activity" . "downregulation of cyclin-dependent protein kinase activity" . "inhibition of cyclin-dependent protein kinase activity" . "negative regulation of CDK activity" . . . . .