In a fleering manner; with mockery, contempt, or scornful laughter.
From 'fleering' (present participle/adjective) plus the adverbial suffix '-ly,' transforming an adjective describing a quality into an adverb describing how an action is performed.
Adverbs like 'fleeringly' are the weapons of precise writers—instead of 'he laughed mockingly,' you can say 'he laughed fleeringly' and the reader feels a darker, more contemptuous expression.
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