A trustworthy person is reliable, responsible, and can be trusted completely. He is a trustworthy and level-headed leader. + trustworthiness trust·worthi·ness He wrote a reference for him, describing his reliability and trustworthiness as `above questioning'. someone who is trustworthy can be trusted and depended on = dependable
taking responsibility for one's conduct and obligations; "trustworthy public servants" worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion
[ 'tr&st ] (noun.) 13th century. Middle English, probably of Scandinavian origin; akin to Old Norse traust trust; akin to Old English trEowe faithful; more at TRUE.