Addle is a White Magic Enfeebling spell that inflicts a status of the same name decreases an enemy's Magic Accuracy and increases spellcasting time. It can be learned by the Red Mage (level 83) and White Mage (level 93).
Addle is a caster role action, it lowers an enemies intelligence and mind stat by 10%, effectively lowering their magic damage. It can be used by the Black Mage, Red Mage, Summoner and Blue Mage. The ability shares a similar effect to the removed Virus command and even shares a similar icon.