English undo

← Old English ondōn (inherited)

← English un (prefix)

← English do (prefix)

← Middle English undōn (inherited)

← West Frisian ûndwaan (cognate)

← West Frisian ûntdwaan (mention)

← Proto-Germanic *andadōną (inherited)

← Dutch ontdoen (cognate)

→ English loose (link)

→ English undone (affix)

→ English undoing (affix)

→ English undoable (suffix)

→ English undoer (suffix)

→ English unundoable (affix)

→ English undoeth (suffix)

→ English undoest (suffix)