Synonyms for «painstaking research»

tedious grueling rigorous meticulous painful laborious lengthy careful intense diligent hard frustrating extensive exhausting exhaustive excruciating arduous difficult tiring thorough fascinating tiresome tough much intensive deep ongoing thoughtful serious scientific onerous tricky exacting strenuous long extreme tremendous interesting necessary huge daunting endless great heavy relentless significant expensive intricate challenging

study search investigation work analysis researchers testing exploration project task detail science experimentation effort experiments review process paper care examination time deal hours thought attention paperwork scrutiny trial labor planning dedication amount legwork topic lot subject patience inquiry investment preparation practice experience observation bit endeavor evaluation job tools methods