The word "untwist" refers to the act of undoing the twist or untangling something. Its antonyms, which are words that have the opposite meaning, include "twist," "entwine," "coil," "tangle," "curl," "inextricable," and "knotted." These words describe the opposite of "untwist." For example, "twist" means to turn or rotate something, while "entwine" means to wrap or twist something around or through something else. "Coil" means to wind something into a series of connected loops or rings, while "tangle" means to get caught up or intertwine in a mess of threads or wires.