unfunEtymologyFrom un- + fun.adjNot fun.“Poor Holly had the massive misfortune of having an assistant principal for a mother, which, Alexa knew, made her life unfun both in and out of school.”nounLack or absence of fun; funlessness.“I love going to the theater but the third week of February was putting a major damper on the experience. First it was Big Deal — a dismal evening of overblown un-fun — then Glengarry Glen Ross in which a lot of straight men talked dirty and made real estate deals.”