======================================================================================= sed·u·lous ˈsejələs/ adjective adjective: sedulous (of a person or action) showing dedication and diligence. "he watched himself with the most sedulous care" synonyms: diligent, careful, meticulous, thorough, assiduous, attentive, industrious, conscientious, ultracareful, punctilious, scrupulous, painstaking, minute, rigorous, particular "he picked the thorn from his leg with sedulous care" Origin mid 16th century: from Latin sedulus ‘zealous’ + -ous.