More foul, contaminated, or dirty; comparative form suggesting greater contamination.
Comparative form of 'befoul' or related to 'foul,' created with the '-er' comparative suffix (Old English '-or'). This represents the comparative degree of fouling.
This is interesting because English has two ways to compare 'foul'—'fouler' versus 'befoulier'—and while 'fouler' is standard, 'befoulier' emphasizes active contamination, making it feel like something was deliberately made more foul.
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