Entry 2 senses · 2 variants Webster, 1913 Doubtless · Doubt·less · IPA /ˈdaʊ̯tləs/ a. adv. 01 a. Free from fear or suspicion. 1. Free from fear or suspicion.[Obs.] “Pretty child, sleep doubtless and secure.” — Shak. 02 adv. Undoubtedly; without doubt. 1. Undoubtedly; without doubt.