Trustful, a.
1. Full of trust; trusting.
2. Worthy of trust; faithful; trusty; trustworthy. -- Trust"ful*ly,adv. -- Trust"ful*ness, n.
Shades of meaning
Fernald lists trustful only as an antonym, under envious.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given