doubtful
adjectivemasculine/feminine/duviˈdozu/medium
du·vi·do·so
Definition
Causing or arousing doubt; uncertain, questionable.
The origin of the money is quite doubtful.
The study's results are doubtful.
Common collocations
doubtful characterdoubtful origindoubtful ethics
Etymology
Do latim 'dubiosus', de 'dubium' (dúvida).