Biological process

down regulation of phospholipid biosynthetic process, down-regulation of phospholipid biosynthetic process, downregulation of phospholipid biosynthetic process, negative regulation of phospholipid anabolism, negative regulation of phospholipid biosynthesis, negative regulation of phospholipid formation, negative regulation of phospholipid synthesis

Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of phospholipids.