constancy Play nounThe quality of being faithful and dependable. SYNONYMS applicationcommitmentdedicationdependabilitydeterminationdevotiondoggednessfaithfulnessfidelityfirmnessfixednessloyaltyobstinacyperseverancereliabilityresolutenessresolutionresolvestaunchnessstaying powersteadfastnesssteadinesstenacitytruenesstrustworthiness