bar sinister bar·si·nis·ter uncommon noun 1. the status of being born to parents who were not married Synonymsbastardyillegitimacybar sinister 2. a mark of bastardy; lines from top right to bottom left Synonymsbar sinisterbend sinister Related words Broader terms markordinarystatus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
