sceptical

Used to express a high degree of doubt.

A common and strong way to express a high degree of doubt.

Indicates a profound and firmly held doubt.

Used to express a very high degree of doubt.

Becoming more and more doubtful over time.

Having doubts at the beginning, but with the possibility of being convinced later.

To express a small amount of doubt.

To express a mild or small amount of doubt.

To express a moderate degree of doubt.

Being sceptical for reasons that are easy to understand.

Being sceptical as a normal or expected reaction.

To hold an attitude of doubt.

To continue to be doubtful despite new information or persuasion.

To appear doubtful through one's expression.

To convey doubt through one's tone of voice.

To start having doubts about something.

Used to specify the subject of doubt, often an idea, plan, or claim.

Similar to 'about', used to specify the object of doubt, often something more abstract or a source of information.

A more formal way to introduce a clause explaining what the doubt is about, typically followed by 'whether' or a 'wh-' word.