untrust noun 2verb 2adjective 1forms 5 noun2 •Lack or absence of trust; mistrust.Alternatively, untrust corresponds to the space between distrust and trust, in which an agent is positively trusted, but not sufficiently to cooperate with. — 2006 •The zone representing everything that originates outside of the firewall.The untrust zone is designed typically for the Internet or other undesirable places. — 2011 verb2 •To fail to trust; to distrust.Material or labor trusted in one State would have to untrust itself at crossing into the next . — 1897 •To mark or flag (something) as untrustworthy.To untrust one document, you have to untrust them all.· — 2010 adjective1 •(no longer used) Faithless; distrustful. formsuntrusted · untrusting · untrusts · more untrust · most untrust