assiduousness

attentive and persistent effort with painstaking assiduousness investigators finally cracked the case of the stolen works of art Synonyms assiduity, diligence, industriousness, industry, sedulity, sedulousnessRelated Words application, attentiveness, attention, care, concentration; doggedness, perseverance, persistence, tenacity, tirelessness; bother, effort, effortfulness, pains, painstaking, troubleNear Antonyms carelessness, negligence, slackness; idleness, indolence, laziness