negatively regulates negatively regulates biological_process glycoprotein biosynthetic process regulation of glycoprotein biosynthetic process negative regulation of glycoprotein biosynthetic process Any process that decreases the rate, frequency, or extent of the chemical reactions and pathways resulting in the formation of glycoproteins, any protein that contains covalently bound glycose (i.e. monosaccharide) residues; the glycose occurs most commonly as oligosaccharide or fairly small polysaccharide but occasionally as monosaccharide. GO:0010561 biological_process negative regulation of glycoprotein metabolic process negative regulation of cellular macromolecule biosynthetic process