<span class="searchmatch">Hohlköpfe</span> nominative/genitive/accusative plural of Hohlkopf...
From hohl + Kopf. Hohlkopf m (strong, genitive <span class="searchmatch">Hohlkopfes</span> or Hohlkopfs, plural <span class="searchmatch">Hohlköpfe</span>, feminine (rare) Hohlköpfin) (derogatory) stupid person; airhead...