Lewis Short
(verb) : sub -dŭbĭto, āre
* 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary