Emily Dickinson Lexicon

DOUBT'FUL-LY, adv.

1. In a doubtful manner; dubiously. – Spenser.
2. With doubt; irresolutely.
3. Ambiguously; with uncertainty of meaning. Nor did the goddess doubtfully declare. – Dryden.
4. In a state of dread. [Obs.] – Spenser.