Wiktionary
not bear thinking about
adv. Too frightening or upsetting to even contemplate.
Usage examples of "not bear thinking about".
It was a sad truth, and one that did not bear thinking about, but the Warlock's curiosity was strong.
If he was caught the consequences did not bear thinking about, but if he got away with this he would possess the essence of the Sparrow's magic.
The current confusion in the Oasis of Tall Cranes did not bear thinking about—.
The future without Kerrick, cold and empty, did not bear thinking about.
What would happen to an ensign left in the clutches of Ezquerra did not bear thinking about.
Some would be burned alive, some flayed, some, but no, it did not bear thinking about.