I'm not doubting your story, I just have a few clarifying questions to ask.
I am now doubting your honesty.He was doubting his actions that day.
I was doubting that she was telling the truth^ In this answer doubting is used as a verb. The word doubting can be used as a verb (somehow informal because DOUBT is a stative verb). It can also be used as an adjective according to some dictionaries (although dubious would be the best word)It was a very doubting/dubious answer (an adjective)
DOUBTing
Doubting
I told Ben that the butterfly finally emerged from the cacoon, but he was a doubting thomas and needed to see for himself.
To use the doubting Thomas idiom in a sentence, you might say "Fred wouldn't believe in a ghost unless he saw one himself, he is such a doubting Thomas. " The idiom refers to a person who will not believe something without strong evidence.
I told Kim that the tickets had been found, but being a doubting Thomas, she wouldn't believe me until she saw them.
Wondering about the veracity of something
The word for doubting whether something is true is "skepticism." It refers to an attitude of questioning or doubting claims or beliefs, often requiring evidence before accepting something as true. Skepticism is commonly applied in various fields, including science, philosophy, and everyday life.
The term for this is cynicicm, and the person is a cynic.
Faith-doubting holy man who encounters a case of demonic possession that could turn out to be real.
Doubting is two syllables. The b is silent.