Late 17th century; earliest use found in John Sergeant (1623–1707), Roman Catholic controversialist and philosopher. From penetrative + -ly. Compare French pénétrativement.
Definition of penetratively in US English:
penetratively
adverbˈpɛnɪtrətɪvli
In a penetrative manner; with penetration.
Origin
Late 17th century; earliest use found in John Sergeant (1623–1707), Roman Catholic controversialist and philosopher. From penetrative + -ly. Compare French pénétrativement.