trustworthy (adj.)

• accurate
• authoritative
• believable
• calculable
• conceivable
• convincing
• credible
• dependable
• ethical
• exact
• fail-safe
• faithful
• fast
• fiduciary
• firm
• guaranteed
• harmless
• honest
• honorable
• incorruptible
• invincible
• inviolable
• invulnerable
• loyal
• moral
• plausible
• predictable
• principled
• proven
• realistic
• reliable
• responsible
• riskless
• scrupulous
• secure
• solid
• sound
• stable
• staunch
• steadfast
• steady
• straight
• substantial
• sure
• tenable
• tested
• tried
• true
• trusty
• truthful
• unexceptionable
• unfailing
• unhazardous
• unimpeachable
• unquestionable
• upright
• valid
• veracious
• well-founded
• well-grounded