baneful

From bane +‎ -ful.

baneful (comparative more baneful, superlative most baneful)

1. (archaic) Poisonous, deadly.
   • 1791, Homer, “[The Iliad.] Book XXII.”, in W[illiam] Cowper, transl., The Iliad and Odyssey of Homer, Translated into Blank Verse, […], volume I, London: […] J[oseph] Johnson, […], →OCLC, page 577, lines 106–109:

     [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.
   • 1791 (date written), Mary Wollstonecraft, A Vindication of the Rights of Woman: With Strictures on Political and Moral Subjects, London: […] J[oseph] Johnson, […], published 1792, →OCLC:

     This contempt of the understanding in early life has more baneful consequences than is commonly supposed […]

• fatal
• mortal

• helpful
• productive

• bane
• banefully
• banefulness