doubtless

无疑地、肯定、确实

The new policy will doubtless upset a lot of employees.

新政策无疑会让许多员工感到不满。

想必、大概、八成表推测

You are doubtless wondering why I called this meeting.

你想必正在纳闷我为什么召开这场会议。

无疑的、确定的旧式

Her talent is a doubtless fact that no one questions.

她的才华是无人质疑的确定事实。