14 letters · 20 points in Scrabble
noun misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.)
originComposed of dis- + information. Attested in the sense “intentional misinformation” in English from 1939. A different usage of disinformation occurred earlier, as early as 1887, as a simple synonym of misinformation.
Etymology from Wiktionary, CC BY-SA 3.0