Usage Note
Lenteur is typically used in a negative register, implying frustrating or excessive slowness — la lenteur de la justice (the slowness of justice). The adjective lent (slow) is its root; the adverb lentement (slowly) is the everyday form learners encounter first.
Examples
"La lenteur du service m'a agacé."
Natural Translation
The slowness of the service annoyed me.

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