dubious vs in question

dubious and in question both are adjectives.

Word	Noun	Adjective	Verb	Adverb
dubious	No	Yes	No	No
in question	No	Yes	No	No

As adjectives, dubious and in question are synonyms defined as:

Other synonyms of dubious include doubtful, dubitable.

dubious (adjective)	in question (adjective)
open to doubt or suspicion	open to doubt or suspicion
fraught with uncertainty or doubt
not convinced