1. 有害的；恶意的；邪恶的
Baleful means harmful, or expressing harmful intentions.

1. threatening or foreshadowing evil or tragic developments

e.g. a baleful look
forbidding thunderclouds
his tone became menacing
ominous rumblings of discontent
sinister storm clouds
a sinister smile
his threatening behavior
ugly black clouds
the situation became ugly

Synonym: forbiddingmenacingminaciousminatoryominoussinisterthreatening

2. deadly or sinister

e.g. the Florida eagles have a fierce baleful look

Synonym: baneful