plural unsubs
US law enforcement, informal
: the unknown perpetrator of a crime
Not one but two murderous unsubs are on the loose in tonight's Criminal Minds …—TV Guide
Rhyme remembered the thousands of times he'd run crime scenes. Sometimes a miracle would happen. He'd be looking around and somehow ideas about the unsub would come to him. He couldn't explain how.—Jeffery Deaver
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Merriam-Webster unabridged
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