Any process that stops, prevents, or reduces the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of flavonoids.
Synonyms:
exact_synonym:
down regulation of flavonoid biosynthetic process; downregulation of flavonoid biosynthetic process; negative regulation of flavonoid anabolism; negative regulation of flavonoid biosynthesis; negative regulation of flavonoid formation; negative regulation of flavonoid synthesis