fiendy

English

Etymology

From Middle English feendy, fendi, equivalent to fiend +‎ -y.

Adjective

fiendy (comparative fiendier or more fiendy, superlative fiendiest or most fiendy)

1. Like a fiend; fiendish
   • 1915, Robert Grant, The High Priestess, page 375:

     He got so fiendy finally that Mrs. Ford — she's a dear if there ever was one — went up and put her arms around his neck, so as to stop him by a kiss.

   • 1969, Glendon Fred Swarthout, Kathryn Swarthout, The button boat, page 127:

     "But the fiendiest one of all," whispers his sweet companion, "is Boiler-Room Bessie."