Nullify means to remove the force, effectiveness, or value of something. The thing nullified is the refered to as null and void, or as being a nullity. It may refer to the invalidation of something by court order, on legal or ethical grounds of unsoundness.
Controversy exists over the issue of judicial activisim, in which judges are sometimes accused of nullifying law according to their own will, deliberately ignoring inconvenient facts and even settled rules of law in order to obtain their desired result. Juries may also nullify the law instructed to be applied in a case to be decided, which is refered to as jury nullification.
