Home › Words › U › unplanunplanunplan means to undo the planning of (something previously planned); to cancel.Among words judged in Lexicurio's Arena, unplan ranks #11,411 of 42,762 for Qualifying.EtymologyFrom un- + plan.verbTo undo the planning of (something previously planned); to cancel.e.g.“O, Goodness! help me to unplan that plan, and to unpurpose that purpose!” — 1854, Henry H. Tator, Brother Jonathan's cottage, page 186:Definitions & examples from Wiktionary (CC BY-SA 3.0).