I am doubtful that you have been conjunct
And bosomed with her.
Shak.
Syn. -- Wavering; vacillating; hesitating; undetermined; distrustful; dubious; uncertain; equivocal; ambiguous; problematical; questionable.
Doubt"ful*ly (?), adv. In a doubtful manner.
Nor did the goddess doubtfully declare.
Dryden.
Doubt"ful*ness, n. 1. State of being doubtful.
2. Uncertainty of meaning; ambiguity; indefiniteness. " The doubtfulness of his expressions." Locke.