1. Tested and proved to be reliable
   - tested, time-tested, tried

See also: dependable, reliable

• consciousness
• consciousness-altering drug
• conscript
• conscription
• consecrate
• consecrated
• consecration
• consecrator
• consecratory
• consecutive
• consecutive operation
• consecutively
• consensual
• consensus
• consent
• consent decree
• consentaneous
• consenter
• consentient
• consenting
• consequence
• consequent
• consequential
• consequentially
• consequently