doubtfully
Keeton shook his head doubtfully.
基頓疑惑地?fù)u了搖頭。

Do not confuse doubtful, dubious, and suspicious. If you feel doubtful about something, you are unsure about it or about whether it will happen or be successful. Do you feel insecure and doubtful about your ability?... It was doubtful he would ever see her again. If you are dubious about something, you are not sure whether it is the right thing to do. Alison sounded very dubious... The men in charge were a bit dubious about taking women on. If you describe something as dubious, you think it is not completely honest, safe, or reliable. ...his dubious abilities as a teacher. If you are suspicious of a person, you do not trust them and think they might be involved in something dishonest or illegal. I am suspicious of his intentions... Miss Lenaut had grown suspicious. If you describe something as suspicious, it suggests behaviour that is dishonest, illegal, or dangerous. He listened for any suspicious sounds. ...in suspicious circumstances.
不要混淆 doubtful, dubious, suspicious。doubtful 指不確定某事或不確定其是否會發(fā)生或成功：Do you feel insecure and doubtful about your ability（你對自己的能力缺乏信心，抱有懷疑嗎），It was doubtful he would ever see her again（他會不會再見到她還說不準(zhǔn)）。dubious 指拿不準(zhǔn)做某事是否正確：Alison sounded very dubious（艾利森聽上去猶豫不決），The men in charge were a bit dubious about taking women on（幾位男性負(fù)責(zé)人有點兒拿不準(zhǔn)要不要招女員工）。dubious 還可指某事物不完全可信、安全或可靠：his dubious abilities as a teacher（他的教學(xué)能力令人懷疑）。suspicious 指不信任某人，懷疑其從事欺騙性或不法活動：I am suspicious of his intentions（我懷疑他動機不純），Miss Lenaut had grown suspicious（萊諾小姐已經(jīng)起了疑心）。suspicious 還可指某人的行為可疑、不誠實、涉及非法或具有危險性：He listened for any suspicious sounds（他注意傾聽任何可疑的聲音），in suspicious circumstances（在可疑的情勢下）。