: classification as unfit for military service
also : a person having this classification

Word History

First Known Use

1942, in the meaning defined above

Time Traveler
The first known use of 4-F was in 1942

Dictionary Entries Near 4-F

Cite this Entry

“4-F.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/4-F. Accessed 30 Dec. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!