inarticulacy, n.All

Inarticulacy (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the condition of a slave: understanding something but being unable to put it into words.