[OK, this is where I'm coming from. (Bear with me, I'm mostly explaining this to the non-Hindus here)]
Of course -- and Hindu literature has pretty much been a discussion of the incomprehensible forever. I believe there are things that can't be put into words.
Our language is a tool to describe and communicate in a waking-state (3rd-state) reality.
Hindu 'theology' -- at least Vedantic philosophy -- is about alternate realities; different worlds perceived from expanded levels of consciousness. Even within 3rd state, language is inadequate to describe colour to a blind man, how much more inadequate would it be to describe a qualitatively different reality?
These 'higher' levels aren't describable from a waking-state perspective, they're not even comprehensible. They must be experienced to be grokked.
OK, but you can see the problem here; "qualities" of Brahman? This could only apply to Saguna Brahman; Brahman-with-qualities. Brahman with qualities must needs be a being,; an entity; perhaps a god.
Generally, Brahman is not conceived of as an entity. It's generally described as Nir-guna -- without qualities. Attributes are ascribed to it only to make it discussable -- which Hinduism, for some reason, has always tried to do, even while asserting that, in actual fact, it's incomprehensible.
Just because a thing cannot be put into words doesn't necessarily render it incomprehensible. One can experience, comprehend that experience, and still not be able to describe said experience with words.
An experience of being (Atman) while indescribable, is not necessarily incomprehensible.