baneful

[ beyn-fuhl ]
/ ˈbeɪn fəl /

adjective

destructive; pernicious: a baneful superstition.
deadly; poisonous: baneful herbs.

Origin of baneful

First recorded in 1570–80; bane + -ful
Related formsbane·ful·ly, adverbbane·ful·ness, noun
Can be confusedbaleful baneful
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for baneful

baneful

/ (ˈbeɪnfʊl) /

adjective

archaic destructive, poisonous, or fatal
Derived Formsbanefully, adverbbanefulness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012