ondoorgrondelijk (bn):
incompréhensible(en) difficult or impossible to comprehend, fathom or interpret.
(en) impossible to grasp the extent of, or to fully know or understand., abscons(en) difficult to comprehend or understand., abstrus(en) difficult to comprehend or understand., impénétrable(en) difficult or impossible to comprehend, fathom or interpret., insondable(en) difficult or impossible to comprehend, fathom or interpret.
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