Comparative form of 'dank'; more damp, wet, or unpleasantly moist than something else.
From 'dank' (possibly from Middle Low German 'danke' or Old Norse 'donkr') plus the comparative suffix '-er' (forming comparatives from short adjectives).
Medieval castles were notorious for being 'dank' — that combination of stone, moisture, and lack of ventilation that made them uncomfortable places to live, which is why 'danker' became such a vivid descriptor.
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