painstaking UK /ˈpeɪnzˌteɪkɪŋ/US /ˈpeɪnˌsteɪkɪŋ/adjective 1noun 1forms 3 adjective1 •Carefully attentive to details; studious; diligent in performing a process or procedure.All these painstaking men, considered together, may be said to have completed another species of criticism. — 1781 noun1 •The application of careful and attentive effort.I esteeme Bocace his Decameron, Rabelais, and the kisses of John the second (if they may be placed under this title) worth the paines-taking to reade them. — 1603 formspainstakings · more painstaking · most painstaking