i Register
In some senses, baneful is marked as archaic. Watch for register when choosing this word.
baneful
adj 2
Definitions
adj
1
Poisonous, deadly.
[S]ome fell ſerpent in his cave expects / The traveller's approach, batten'd vvith herbs / Of baneful juice to fury, forth he looks / Hideous, and lies coil'd all around his den.
2
Harmful, injurious.
This contempt of the understanding in early life has more baneful consequences than is commonly supposed […]
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