
Full Form: Unknown
Abbreviations: Unk. & Unkn.
Meaning: Something that is not identified, recognized, discovered, or known.
Defining Unknown with Usage Examples
“Unknown” describes a person, thing, fact, or situation whose identity, nature, or details have not been established. It is commonly used in records, research, medicine, technical documentation, and everyday communication when information is unavailable or uncertain.
Examples:
- The cause of the problem remains unknown.
- The package was sent by an unknown sender.
- Scientists are investigating an unknown species.
- The patient’s medical history was unknown at the time.
- The painting’s original artist is unknown.
Correct Usage of Unknown Abbreviation
The abbreviation for unknown is commonly written as “Unk.” or “Unkn.” These shortened forms are particularly useful in forms, databases, charts, records, and notes where space is limited. “Unk.” is the more common abbreviation for unknown, while “Unkn.” may be used when additional letters are needed to make the abbreviation easier to recognize.
Examples using “Unk.”:
- The cause of the error is listed as Unk.
- The patient’s previous address is Unk.
- The item’s original owner is Unk.
- The source of the information remains Unk.
Examples using “Unkn.”:
- The suspect’s current location is marked Unkn.
- The date of the event is currently Unkn.
- The file contains an Unkn. error code.
- The material’s exact composition is Unkn.
Quick Recap
The abbreviation for unknown is generally written as “Unk.”, with “Unkn.” serving as a less common alternative. These forms are most useful in records and other situations where concise notation is preferred.

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