1 : lacking a head or having the head reduced
2 : lacking a governing head or chief
1 : The acephalous body of the humanoid was hard to identify, but his clothes suggested he was a member of the royal guard.
2 : After the successful regicide in Tornya, the suddenly acephalous nation was thrown into a state of chaotic conflicts over succession.
Oof, this one’s interesting. I can see uses for both meanings in RPGs, and while the first one is listed as a medical definition, there’s nothing stoping it from being in the vocabulary of any historian, spy, or investigator you may want to throw at the party. Also, the second meaning can make for some interesting double meanings in conversation. Then there’s the obvious double entendre of the second half of the first meaning. Yeah this word can make mess of your table.