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Webster 1913 Edition

Adj.

[AS.

feóndlic

Fiendlike; monstrous; devilish.

[Obs.]

Chaucer.

fiendly ‎(comparative more fiendly, superlative most fiendly)

(obsolete) Hostile.
(now rare) Like a fiend; devilish.
- 1485, Sir Thomas Malory, chapter primum, in Le Morte Darthur, book XI:
  Soo whanne sir Laūcelot came thydder / he sawe wryten vpon the tombe letters of gold that said thus / Here shalle come a lybard of kynges blood / and he shalle slee this serpent / […] / Soo thenne sir launcelot lyfte vp the tombe / and there came out an horryble & a fyendly dragon spyttynge fyre oute of his mouthe