Uninstall module for which an update is pending?
Slight correction to Clive's comment above: as soon as you disable the module, it is inactive in the system tables. When you uninstall it, all of its data is erased from the database. The fact that a module has pending updates won't affect the operation of disabling or uninstalling it, but beware of re-enabling a module that has been disabled for a period of time.  For way too much information on this subject, see: https://drupal.org/node/1199946