negatively regulates developmental process negative regulation of biological process regulation of developmental process negative regulation of developmental process downregulation of developmental process down-regulation of developmental process down regulation of developmental process inhibition of developmental process GO:0051093 Any process that stops, prevents or reduces the rate or extent of development, the biological process whose specific outcome is the progression of an organism over time from an initial condition (e.g. a zygote, or a young adult) to a later condition (e.g. a multicellular animal or an aged adult). biological regulation