1. threatening or suggesting evil; ominous
Usage: formal; literary
2. located on or relating to the left side
Usage: archaic; heraldry

Examples

• The sinistrous clouds gathered overhead, warning of the approaching storm.
• His sinistrous smile made everyone in the room uncomfortable.
• The ancient text described sinistrous omens appearing before the battle.
• In heraldry, the sinistrous side of the shield represents the left.
• The sinistrous figure lurked in the shadows of the alley.
• She felt a sinistrous presence watching her from the dark woods.