IPA: /ˈdeɪtɪdli/
KK: /ˈdeɪtɪdli/
In a way that is old-fashioned or no longer relevant.
The film was criticized for its datedly portrayal of gender roles.
Datedly → It is formed from "date" (from Old French *date*, meaning a specific time or day) and "-ly" (meaning in a manner of). The word "datedly" means in a manner that relates to a specific time or date.
Think of the word 'date' as referring to a specific time, and remember that 'datedly' means doing something in a way that relates to that specific time.