- The definition of unlikely is something that is probably not going to happen or that has a very slim chance of occurring.
The chance of snow in June in Florida is an example of something that would be described as unlikely.
unlikely definition by Webster's New World
- not likely to happen or be true; improbable
- not likely to succeed; not promising
Origin: Middle English unlikly, probably based on Old Norse ūlīkligr
unlikely definition by American Heritage Dictionary
adjective un·like·li·er, un·like·li·est
- Not likely; improbable.
- Not promising; likely to fail.
- un·likeˈli·ness noun