In a besotting manner; in a way that causes infatuation or foolish intoxication.
From 'besotting' (present participle/adjective) plus the adverbial suffix '-ly.'
Stacking suffixes like '-ing' and '-ly' shows how English can modify meaning layer-by-layer: 'besot' → 'besotting' → 'besottingly,' each layer adding nuance!
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