险恶的
不祥的
不吉利的

Sinistrous \Sin"is*trous\, a. [See {Sinister}.]
1. Being on the left side; inclined to the left; sinistral.
``Sinistrous gravity.'' --Sir T. Browne.

2. Wrong; absurd; perverse.

A knave or fool can do no harm, even by the most
sinistrous and absurd choice. --Bentley.