doubting is a form of:

Doubt



noun
1.
(a feeling of uncertainty about some thing, an undecided state of mind, a feeling of disbelief, an uncertain state of affair) feel doubt ការសង្ស័យ, when in doubt សង្ស័យ, ស្ទាក់ស្ទើរចិត្ដ, in doubt មិនប្រាកដ, no doubt មុខជា, ពិប្រាកដ, There's no doubt about it ច្បាស់ លាស់, ប្រាកដណាស់ entertain doubt នឹកសង្ស័យ
verb
1.
(TRANSITIVE, INTRANSITIVE) (to be uncertain about, to be inclined to disbelieve) សង្ស័យ, មន្ទិល, ញញើតញញើម, រា, មិនជឿ
Example: I doubt the truth of it, I doubt whether it is true, I doubt his honesty.