Tending to doubt; doubtful.

doubtfully

(intansitive, archaic) to doubt

Capable of being doubted; susceptible of being questioned.

(uncountable, archaic) The process of doubting or the state of being in doubt; hesitation, uncertainty. / (countable, obsolete) A thing to be doubted; a matter that calls for doubt.

plural of dubitation

The quality of being dubitable; questionableness.

doubtfully

doubt; uncertainty

plural of dubitancy