Definition of researchful in English:
researchful
adjective rɪˈsəːtʃf(ʊ)lˈriːsəːtʃf(ʊ)l
Dedicated to or characterized by research.
Origin
Mid 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From research + -ful.