bane

[pioneer]

bane   

bane [bayn]
(plural banes)
noun
1.  something that causes misery: something that continually causes problems or misery
It's the bane of my life.

2.  something that causes ruin: something that causes death, destruction, or ruin (literary or archaic)
3.  deadly poison: a fatal poison (often used in combination in the names of poisonous plants)

[ Old English bana < Germanic]

the bane of somebody's existence or life somebody or something that is a constant source of trouble or annoyance