dependable
de-pend-a-ble
adjective
Able to be relied upon; trustworthy and consistent in performance or behaviour.
"She is a dependable colleague."
Thesaurus
Synonyms: reliable, tested, tried, sure, undeviating, time-tested, certain, tried and true, steady-going, rock-steady, steady, true
Antonyms: undependable, unreliable