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Cf. Old French fraignant, pr. pple. of fraindre to break; fraigneis uproar.
The usual explanation that the word is a corruption of faineant hardly suits the sense.
E-RIC suggests it might be from A.S. freon friend
(Note: presumedly there was an earlier edition )
Made by Maister Edwards (Richard Edwards), 1571
Reproduced in Facsimile 1908