grottendoof

== German == === Etymology === From grotten- +‎ doof. === Adjective === grottendoof (strong nominative masculine singular grottendoofer, not comparable) very stupid; idiotic ==== Declension ==== === Further reading === “grottendoof”, in Digitales Wörterbuch der deutschen Sprache‎[1] (in German) “grottendoof” in Duden online