Examples:
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
threatening (English)
├── -ing (English)
│ ├── -ing (Middle English (1100-1500))
│ │ └── -ing (Old English (ca. 450-1100))
│ └── -inge (Middle English (1100-1500))
└── threaten (English)
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