Since the word "grok" is an English term listed in the Oxford dictionary with the definitions below...
And since neither of the previous words suggested convey the real meaning of comprehension or intuitive understanding -- with one of them having only a non relevant slang meaning -- I think that to grok, grokking, and grokked is the only way to convey the idea of comprehending the "ineffable" (meaning; not capable of being expressed in words) -- such as, the experience of consciousness, qualia, precosmic absolute space, etc.
verb ( grokked, grokking) target='_blank'> trans.
understand (something) intuitively or by empathy : because of all the commercials, children grok things immediately.
â€¢ target='_blank'> intrans.
empathize or communicate sympathetically; establish a rapport.
ORIGIN mid 20th cent.: a word coined by Robert Heinlein (1907â€“88), American science fiction writer, in Stranger in a Strange Land.