What is the comparative and superlative form of doubtful?

Here's the breakdown of the comparative and superlative forms of "doubtful":

* Doubtful (adjective) - This is the base form, expressing uncertainty or a lack of certainty.

It's important to note that "doubtful" is not typically used in comparative or superlative forms. This is because the concept of "doubt" is not easily ranked. You can't have something being "more doubtful" or "most doubtful" in the same way you can compare size or weight.

Instead, you would use synonyms that have comparative and superlative forms to express varying degrees of uncertainty:

* More uncertain / Most uncertain

* More questionable / Most questionable

* More suspicious / Most suspicious

Example:

Instead of saying "This evidence is more doubtful than the other," you might say:

* "This evidence is more uncertain than the other."

* "This evidence is more questionable than the other."