To hesitate or doubt something.
Examplesentence: The teacher was dubious of Marcus's homework excuse.
Teacher: Good morning, class.
Now before weget started with today's lesson, I need you to bring me your homework.
*sad music plays* Marcus, what is the matter? Oh no.
I don't think I am feeling very well.
I think he's trying to get outof turning in his homework.
BENJAMIN! Thanks, but no thanks.
I think I'llbe the judge of that.
You were perfectly fine this morning.
Could it be true that you didn't do your homework? Well.
I did it, but there is a good reasonwhy I don't have it with me.
And what reason would it be? Umm.
My dog ate it.
*kids laughing* Well.
I find your excuse to be rather dubious.
Why don't you believe me Mrs.
Watson? I highly doubt your excuse, primarily becauseit's the oldest excuse in the book.
Also, you've done this before.
Hey Roscoe! Give that back! MOM! Wish you had a dog now?.
Source: Youtube subtitles