overinsured Syllabification: (o·ver·in·sured)Pronunciation: /ˌōvərinˈSHo͝ord/Definition of overinsured adjective having insurance coverage beyond what is necessary. Derivatives overinsurancePronunciation: /-ˈSHo͝orəns/ noun overinsured in other Oxford dictionaries Definition of overinsured in the British & World English dictionary