Another lovely word from the OED

Not one I expect to use all that often, but this time it's the two possible meanings I like.

obsidional, adj.

 

1.  Of or relating to a siege; spec. designating a wreath of grass or weeds conferred as a mark of honour upon a Roman general who raised a siege, esp. in obsidional crown, or designating coins struck, or another object serving the purpose of a coin, in a besieged town as a substitute for regular coins.

 

2.  Inclined to bore people by staying too long.