foir-éigneach
Definitions (by source)
extremely violent; tart, 1234; fonn, 2051, 10001; íota, 9245; go f., 5208; compar. –nighe, an ciontach is f. ré déanamh an uilc, 10337
Trí Bior-Ghaoithe an Bháis: The Three Shafts of Death. Editor: Osborn Bergin.