disbelieving is a form of:

Disbelieve



noun
1.
(បច្ចេកទេស) មិនជឿ
verb
1.
(TRANSITIVE) ~ in something (to refuse or be unable to believe, to refuse to believe [in]) គ្មានសទ្ធា, មិនជឿ, មិនស្ដាប់