sinister

threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly blac

बड़ों के सामने नंगे सिर आना अशुभ समझा जाता है.

It was believed that when a black cat crosses ones path, is a sinister.