a taboo subject
... 隐晦 obscurity 隐晦 obscurity 隐讳 a taboo subject; sth best kept secret ...
avoid mentioning
隐讳
esoteric teaching
communicative
dodge about
隐讳,汉语词汇,拼音yǐn huì,意思是因有难言之隐或忌讳而隐瞒不说。