9 letters · 11 points in Scrabble
noun an irrational motive for performing trivial or repetitive actions, even against your will
noun an unhealthy and compulsive preoccupation with something or someone
originFrom Latin obsessio (“a besieging”), from obsidere (“to besiege”); see obsess. Equivalent to obsess + -ion.
Etymology from Wiktionary, CC BY-SA 3.0