tried, time-tested, dependable, trusty, sure, trustworthy, faithful, tried and true, true, certain, more...

unreliable, inconsistent, undependable, untrustworthy, erratic

dependable, trustworthy, consistent, steadfast, loyal, responsible, credible, authentic, more...

old, how, more, complete, practical, late, carbohy

keeps promises,   can be trusted,   most dependable,   trust worthy,   most trusted,   like good used cars,   trusted member,   not failing,   able to be trusted,   never fails