What's the adjective for unprecedently? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs precede and precedent which may be used as adjectives within certain contexts.
precedent
Happening or taking place earlier in time; previous or preceding. [from 14th c.]
(now rare) Coming before in a particular order or arrangement; preceding, foregoing. [from 15th c.]
“And we are off to the races, an unending series of events each caused by the preceding event in the series.”
“Now that I've said that, allow me to apologize for the grandiloquence and pomposity of that preceding paragraph.”
“It is deemed proper to present a general description of the range of the commercial activities of Saint Louis, such as was presented in a preceding report on the internal commerce of the United States.”