. "Any process that decreases the rate, frequency or extent of mononuclear cell migration. Mononuclear cell migration is the movement of a mononuclear cell within or between different tissues and organs of the body." . . . "negative regulation of mononuclear cell migration" . "down regulation of mononuclear cell migration" . "down-regulation of mononuclear cell migration" . "downregulation of mononuclear cell migration" . "inhibition of mononuclear cell migration" . . .