1. trustworthy (vs. untrustworthy), trusty, authentic, reliable, creditworthy, responsible, dependable, honest, reliable, true(predicate), fiducial, sure, trusted, faithful, honest#1, honorable, reliable#1, dependable, responsible

usage: worthy of trust or belief; "a trustworthy report"; "an experienced and trustworthy traveling companion"

2. trustworthy, responsible (vs. irresponsible)

usage: taking responsibility for one's conduct and obligations; "trustworthy public servants"

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See also: trustworthy (Dictionary)