關於「Synonym for doubtfully」標籤，搜尋引擎有相關的訊息討論：

131 Synonyms & Antonyms for DOUBTFUL | Thesaurus.comwww.thesaurus.com › browse › doubtfulSynonyms of doubtfully - Merriam-Websterwww.merriam-webster.com › thesaurus › doubtfullyDOUBTFUL Synonyms: 144 Similar and Opposite Wordswww.merriam-webster.com › thesaurus › doubtful14