dubious vs unsure

dubious and unsure both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dubious	No	Yes	No	No
unsure	No	Yes	No	No

dubious (adjective)	unsure (adjective)
open to doubt or suspicion	lacking or indicating lack of confidence or assurance
fraught with uncertainty or doubt	lacking self-confidence
not convinced