[1870–75; un-1 + stalk1 + -ed2]This word is first recorded in the period 1870–75. Other words that entered Englishat around the same time include: Mafia, Victorian, billing, giveaway, linkageun- is a prefix meaning “not,” freely used as an English formative, giving negative oropposite force in adjectives and their derivative adverbs and nouns (unfair; unfairly; unfairness; unfelt; unseen; unfitting; unformed; unheard-of; un-get-at-able), and less freely used in certain other nouns (unrest; unemployment); -ed is a suffix forming the past participle of weak verbs (he had crossed the river), and of participial adjectives indicating a condition or quality resulting fromthe action of the verb (inflated balloons). Other words that use the affix -ed include: classified, connected, limited, registered, truncated