Also means
reliability
Usage Note
Serietà is an invariable noun ending in a stressed -à, so its plural is identical to the singular: la serietà, le serietà (though the plural is rarely used). It denotes the quality of being serious, dependable, and responsible — often used in professional contexts (un'azienda di serietà = 'a company of integrity'). Being a -tà noun it is always feminine and never adds a plural ending, like città, libertà, qualità.
Examples
"Apprezzo la tua serietà nel lavoro."
Natural Translation
I appreciate your seriousness at work.

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