Ominous; giving a sense of bad luck or an ill omen; suggesting something unfortunate or sinister.
黒猫を見かけると不吉だと信じている人もいる。
Some people believe that seeing a black cat is unlucky.
その話には不吉な予感が含まれていた。
That story contained an ominous feeling.
大きな地震の前触れのような出来事が続き、村では不吉だと噂された。
Events that seemed like a prelude to a big earthquake continued, and people in the village said it was ominous.