Early 17th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From un- + powerful, originally after Italian †impoderoso.
Definition of unpowerful in US English:
unpowerful
adjective(ˌ)ʌnˈpaʊəf(ʊ)l
Not powerful.
Origin
Early 17th century; earliest use found in John Florio (1553–1625), author and teacher of languages. From un- + powerful, originally after Italian † impoderoso.