Definition of cloud of unknowing in English:

cloud of unknowing

noun

figurative
  • A metaphorical cloud representing the impossibility of comprehending God by means of reason; a barrier to human comprehension of the divine which cannot be overcome by learning or intellect; (in later use, also more generally) a situation in which no understanding or certainty is possible; a state of ignorance, uncertainty, or confusion.

Origin

Late Middle English; earliest use found in The Cloud of Unknowing.