A doubtful thing
Lack of trust or confidence:
Doubt about fundamental religious doctrines
The definition of a wonder is someone or something that amazes people, or something miraculous or amazing.
An indefinite but limited number; some:
Find another word for doubtfulness. In this page you can discover 11 synonyms, antonyms, idiomatic expressions, and related words for doubtfulness, like: doubt, dubiety, dubiousness, incertitude, mistrust, question, skepticism, suspicion, uncertainty, wonder and certain.