With friends like these, who needs inimical people? This adjective, from the Latin “inimicus,” meaning “enemy,” can describe unfriendly people or anything that is intended to obstruct or harm. It came into use in the 16th century, in the sense of someone with a hostile temperament. It has since fallen out of common use, but perhaps that’s a sign that more synonyms for “enemy” aren’t needed in the lexicon.