daffish

fayr frende said Morgan le fay ryde not after that knyght / for ye shalle not wynne no worship of hym / Fy on hym coward saide sire Hemyson / for I wyst neuer good knyghte come oute of Cornewaile / but yf hit were syr Tristram de Lyones / what & that be he said she / Nay nay said he / he is with la beale Isoud and this is but a daffyssh knyght — William Caxton edition, 1485, leaf 205r

"Fair friend, said Morgan, ride not after that knight, for ye shall not win no worship of him. Fie on him, coward, said Sir Hemison, for I wist never good knight come out of Cornwall but if it were Sir Tristram de Liones. What an that be he? said she. Nay, nay, said he, he is with La Beale Isoud, and this is but a daffish knight.