un·u·su·al / ˌənˈyoōzhoōəl/ • adj. not habitually or commonly occurring or done: the government has taken the unusual step of calling home its ambassador it was unusual for Dennis to be late. ∎ remarkable or interesting because different from or better than others: a man of unusual talent.DERIVATIVES: un·u·su·al·ly adv. unusually for a city hotel, it is set around a lovely garden | he made an unusually large number of mistakes. un·u·su·al·ness n.