The Collaborative International Dictionary of English v.0.48:
Trustworthy \Trust"wor`thy\, a. Worthy of trust or confidence; trusty. -- Trust"wor`thi*ness, n. [1913 Webster]WordNet (r) 3.0 (2006):
trustworthiness n 1: the trait of deserving trust and confidence [syn: trustworthiness, trustiness] [ant: untrustiness, untrustworthiness]