бесwithout; lacking+печstove, oven+нadjective-forming suffix meaning “related to or characterized by the base”+ымplural dative / masculine or neuter instrumental
adjective · plural · dativeRare#45,271
carefree, careless
RU: Он оказался беспечным и не проверил документы.
EN: He turned out to be careless and didn’t check the documents.