Words similar to doubtful

Example sentences for: doubtful

How can you use “doubtful” in a sentence? Here are some example sentences to help you improve your vocabulary:

It is doubtful that in conversation he would ever remark, “Up early ...”
Part of the decline may have been due to general market conditions, but it's doubtful that all of it was.
It seems doubtful that Disneyland would carry on this tradition.
This is doubtful, if the U.S. missiles were fired within their range envelopes, which is U.S. practice, because missiles are many times faster than airplanes.
of edicts and recommendations the practicality of which is doubtful, decisions made by committees, etc.