(1)高い確率を示すさま
(2)間違いなく
(3)確実に
(4)ほぼ確実であるさま
(5)without doubt
さらに詳しく
(1)間違いなく
(2)確実に
(3)without doubt; certainly; "it's undoubtedly very beautiful"
(1)疑念をもって
(2)with suspicion; "she regarded the food suspiciously"