say it: PAYN-stay-king
painstaking is an adjective meaning "characterized by extreme care and great effort". It carries one recorded sense.
characterized by extreme care and great effort
“conscientious application to the work at hand”
“painstaking research”
“scrupulous attention to details”
Definitions, synonyms and semantic relations for painstaking come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.