noun, feminine/fa.dɛz/plural: fadaises
uninteresting or banal thought; twaddle
“Ainsi s’établissent les opinions, les croyances, les sectes. Mais comment ces détestables fadaises ont-elles pu s’accréditer ?”
Borrowed from Occitan fadeza, fadeso (“foolishness, self-satisfaction, complacency”), ultimately from Latin fatuus. Compare fade (“insipid”).