This prefix is used in a variety of words, including:
* unforboden (not forbidden)
* ungelæfed (not believed)
* unlic (not likely)
* unsið (not good custom)
It's worth noting that while "un-" is the most common prefix for "not allow," there are other prefixes in Old English that can convey a similar meaning, such as "for-" and "ge-." For example:
* forboden (forbidden)
* geforboden (forbidden)
The choice of prefix would often depend on the specific word and its context.