Synonyms of laboriousness

1 Syllable
heed, care
2 Syllables
intent, quickness, vigor, briskness, keenness
3 Syllables
arduousness, alertness, constancy, exertion, earnestness, attention, industry, heedfulness, intentness
4 Syllables
intensity, diligence, assiduity, industriousness, difficulties, activity, application, carefulness, difficulty, assiduousness, sedulousness
5 Syllables
attentiveness, pertinacity