α. Old English geswincful, Old English geswincfull, Old English geswyncfull, late Old English geswicncfulran (comparative, nominative plural, transmission error).
β. late Old English swincfull, late Old English swyncfull- (inflected form), early Middle English swincful, early Middle English swincfule, early Middle English swinkfulle, early Middle English swinkfullle (transmission error), early Middle English swinncfull ( Ormulum), early Middle English swynkeful, early Middle English swynkful.