sub -dŭbĭto, āre, v. n.,
to be a little doubtful or undecided , to have some hesitation (Ciceron.): antea subdubitabam, Cic. Att. 14, 15, 2: significabant tuae litterae, te subdubitare, quā essem erga illum voluntate, id. Fam. 2, 13, 2.
sub-dubitō —, —, āre, to be somewhat in doubt, hesitate a little: antea: subdubitare te, quā essem ...
An Elementary Latin Dictionary