>'course, that's nothing compared to the P1500 "Ratte":
>
>http://www.kensingtonbooks.com/finditem.cfm?itemid=9384
>
>The Germans didn't classify it as a tank, they classified it as a
>"land cruiser." Something to be said about a fighting vehicle whose
>main armament is 2 280mm naval rifled cannons.

The word you're looking for is "frightening". "Frightening to everything in the area" is a good standby for an expanded definition if desired.

Dear lord, that thing's carrying a pair of 12 inch guns, for Pete's sake! "Land cruiser" is a pretty mild description. (Well, around 11.8 or so, if you want to get technical.) For sheer diameter, that's making a good run at battle cruiser status, although most BCs would mount more guns than that. Still, that is a frightening monstrosity to consider dealing with on a battlefield.