Skeletal– relating to or functioning as a skeleton. I think this word is best with the UK pronunciation “skel-EE- tel” rather than the US “SKEL-eh-tel”.
Amnesia– loss of a block of interconnected memories. The soap opera disease! A cliché plot point so hackneyed that it almost makes me want to use it, just in case it comes back into fashion. Even better is the adjective ‘amnestic’, as in “They were amnestic for the duration of their vacation on Secret Bloody Skull Island. They did not know exactly why. Privately, Charles suspected something terrible had happened.”