dependable (adj.)

• calculable
• fail-safe
• faithful
• fast
• firm
• guaranteed
• harmless
• incorruptible
• invincible
• inviolable
• invulnerable
• predictable
• proven
• reliable
• responsible
• riskless
• secure
• solid
• sound
• stable
• staunch
• steadfast
• steady
• straight
• substantial
• sure
• tested
• tried
• true
• trustworthy
• trusty
• unfailing
• unhazardous
• well-founded
• well-grounded