Yes, dubious is an adjective > (Of questionable character: dubious profits.)
"Dubious" is primarily an adjective that means doubtful or uncertain. It is not a synonym or antonym on its own; rather, it describes a state of skepticism or lack of trust. Synonyms for "dubious" include "suspicious" or "questionable," while antonyms would be "certain" or "trustworthy."
credible
ambiguous, dubious, unclear, indecisive
unlikely , incredible , dubious , unbelievable .
Cautious IS an adjective. An adjective is an action!
Those letters spell the adjective dubious.
"Dubious" is primarily an adjective that means doubtful or uncertain. It is not a synonym or antonym on its own; rather, it describes a state of skepticism or lack of trust. Synonyms for "dubious" include "suspicious" or "questionable," while antonyms would be "certain" or "trustworthy."
I was doubting that she was telling the truth^ In this answer doubting is used as a verb. The word doubting can be used as a verb (somehow informal because DOUBT is a stative verb). It can also be used as an adjective according to some dictionaries (although dubious would be the best word)It was a very doubting/dubious answer (an adjective)
unbelievable, incredible, beyond belief,inconceivable, unthinkable, unimaginable; unconvincing, far-fetched, dubious,implausible, improbable, unrealistic; hard to swallow.
present dubious tense
A Dubious Legacy was created in 1992.
In Dubious Battle was created in 1936.
"A Dubious Legacy" by Mary Wesley has approximately 352 pages.
John Steinbeck wrote In Dubious Battle.
In Dubious Battle has 270 pages.
He gave a dubious explanation for his absence from the meeting, raising suspicions among his colleagues.
The plan to separate the world into nations was quite dubious. Definition is here: http://www.merriam-webster.com/dictionary/dubious