British spelling; in a manner involving drooling or speaking foolish words.
British variant: 'drivelling' (the British present participle form) plus '-ly'. Maintains the doubled 'l' throughout the form.
Even though 'drivellingly' is rarely used, it beautifully shows how British English's spelling rules propagate through every suffix stage—once you double the 'l', it stays doubled all the way through!
Complete word intelligence in one call. Free tier — 50 lookups/day.