Marilla was not to be drawn from the safe concrete into dubious paths of the abstract.
"I never saw anybody with purple eyes," said Diana dubiously.
Marilla looked dubious for a moment.
She led her class to think and explore and discover for themselves and encouraged straying from the old beaten paths to a degree that quite shocked Mrs. Lynde and the school trustees, who viewed all innovations on established methods rather dubiously.
There are no more uses of "dubious" in the book.
Show samples from other sources
She was dubious, but agreed to come with us anyway.
She has a dubious reputation. I wouldn’t count on her.