a. Obs. rare–1. [f. as prec. + -FUL.] Proceeding from fiendish agency.
c. 1590. Marlowe, Faust., Final Chorus.
| Faustus is gone: regard his hellish fall, | |
| Whose fiendful fortune may exhort the wise, | |
| Only to wonder at unlawful things, | |
| Whose deepness doth entice such forward wits | |
| To practise more than heavenly power permits. |
1832. in Webster.
Hence Fiendfully adv.
1847. in Craig.
