unguessable

== English == === Etymology === From un- +‎ guessable. === Adjective === unguessable (comparative more unguessable, superlative most unguessable) Not capable of being guessed. 1898, Henry James, The Turn of the Screw, in The Two Magics, London: Heinemann, Chapter 13, p. 101,[2] What it was most impossible to get rid of was the cruel idea that, whatever I had seen, Miles and Flora saw more—things terrible and unguessable and that sprang from dreadful passages of intercourse in the past.