Crossword clues for the word: UNDOER The word UNDOER has appeared as an answer to at least 11 crossword clues on different crossword puzzles. Crossword clues for UNDOER Showing 1 to 11 of 11 results Clue(s) "One taking back an action in MS Word, say" Cause for a downfall Destroyer Disassembler Disassembler, essentially Hooker's opposite? Lace loosener Lady killer One ruining something Ruinous one Wrecker of plans.