Looking for a word for "not up for discussion" [closed]

Solution 1:

Per Merriam-Webster

verboten (adj): forbidden, prohibited by dictate

"We're Jewish, so talking about Santa Claus at home is verboten."

"Hate speech is verboten on this campus."

Solution 2:

My grandmother never spoke of her family

my mother told me the topic was taboo as she lost them when young.

1.1 A practice that is prohibited or restricted by social or religious custom.

^{from https://en.oxforddictionaries.com/definition/taboo}

Solution 3:

The subject is off-limits:

not to be interfered with, considered, or spoken of

• the subject of sex was off-limits in her family

(M-W)

Several months ago, our daughter made talking about her weight “off-limits".