sinister /ˈsɪnəstɚ/ adjective Learner's definition of SINISTER
[more sinister; most sinister]
: having an evil appearance : looking likely to cause something bad, harmful, or dangerous to happen面露凶相的；邪恶的；有凶兆的；不祥的 -
There was something sinister about him.他身上有某种邪恶的东西。
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He looked sinister.他看起来很邪恶。
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sinister black clouds不祥的乌云