What is a synonym for unlikely?

Here are some synonyms for "unlikely," depending on the context:

General synonyms:

* Improbable

* Unpromising

* Doubtful

* Uncertain

* Remote

* Slim

* Faint

* Unrealistic

More specific synonyms:

* If emphasizing low probability: implausible, unbelievable, improbable

* If emphasizing lack of expectation: unexpected, surprising, unforeseen, out of the blue

* If emphasizing lack of support: unfavorable, unfavorable, unpromising

* If emphasizing negative consequences: risky, hazardous, perilous

The best synonym depends on the specific meaning you want to convey.