There are 2 definitions of unsub in English:

unsub1

Syllabification: un·sub
Pronunciation: /ˈənˌsəb
 
/

verb (unsubs, unsubbing, unsubbed)

[no object] informal
Unsubscribe: a month will cost you just $25 and it’s easy to unsub if you decide it isn’t for you
More example sentences
  • Some are angry because they have to listen to the longer reviews (some are unsubbing).
  • But if you "complete" the game and will never play it again and unsub what's to lose?
  • I unsubbed last year after too many enclosures of piano recitals.

Origin

1990s: abbreviation.

Definition of unsub in:

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Word of the day epyllion
Pronunciation: əˈpilēən
noun
a narrative poem resembling an epic in style...

There are 2 definitions of unsub in English:

unsub2

Syllabification: un·sub
Pronunciation: /ˈənˌsəb
 
/

noun

US informal
(In police use) a person of unknown identity who is the subject of a criminal investigation: putting together these insights will help police come up with a composite picture of the unsub
More example sentences
  • The FBI agents use their profiling and investigative skills to identify the unsub.
  • One of the things we began saying in some of our profiles was that the unsub—the unknown subject—would drive a policelike vehicle.
  • The FBI in its investigation concluded that “the bloody palm print located on the passenger door would have to have been left by the unsub.”

Origin

1970s: abbreviation of unknown subject or unidentified subject.

Definition of unsub in:

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Word of the day epyllion
Pronunciation: əˈpilēən
noun
a narrative poem resembling an epic in style...