baneful

causing harm or ruin pernicious destructive 
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baneful

[adj] - exceedingly harmful
Found on http://www.webdictionary.co.uk/definition.php?query=baneful

Baneful

Bane'ful adjective Having poisonous qualities; deadly; destructive; injurious; noxious; pernicious. ' Baneful hemlock.' Garth. ' Baneful wrath.' Chapman. -- Bane'ful*ly , adverb -- Bane'ful*ness , noun
Found on http://www.encyclo.co.uk/webster/B/11

baneful

deadly adjective exceedingly harmful
Found on https://www.encyclo.co.uk/local/20974

Baneful

• (a.) Having poisonous qualities; deadly; destructive; injurious; noxious; pernicious.
Found on http://thinkexist.com/dictionary/meaning/baneful/
No exact match found