fiendful

== English == === Etymology === From fiend +‎ -ful. === Adjective === fiendful (comparative more fiendful, superlative most fiendful) Full of fiendish arts or spirit. ==== Derived terms ==== fiendfully === Further reading === “fiendful”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.