This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. agent noun of undo; one who undoes.

n. One who undoes anything; especially, one who ruins another.

n. One who undoes, in any sense; one who reverses what has been done; one who ruins.

n. a seducer who ruins a woman

n. a person who destroys or ruins or lays waste to

n. a person who unfastens or unwraps or opens

"I don't think Kinsella is a thinker; he's a doer, or more accurately an undoer."

lady-killer    ladies' man    seducer    person    mortal    individual    someone    soul    somebody