Emily Dickinson Lexicon

doubtless, adv. [see doubt, n.] (webplay: believe, child, divine, fear, eye, go, knowledge, pretty, question).

1. Unquestionably; certainly; absolutely; undeniably; (see Psalms 126:6).
2. For certain; no doubt; indisputably; (see Isaiah 63:16).
3. Without doubt; [fig.] dually; as two.