diligence Play nounCareful and persistent work or effort. SYNONYMS applicationassiduityassiduousnessattentionattentivenesscarecarefulnesscommitmentconcentrationconscientiousnessconstancycontinuancededicationdoggednessearnestnessefforthard workheedfulnessindefatigabilityindustriousnessindustryintentnesslaboriousnessmeticulousnessperseveranceperseverationpersistencepertinacitypunctiliousnessrigorousnessrigoursedulousnessstudiousnesstenacitythoroughnesstirelessnesszealzealousness