treblyPronunciation: /ˈtrɛbli/Definition of trebly adjective (treblier, trebliest) (of sound, especially recorded music) having too much treble; tinny: the sound system delivered a tinny, trebly blare adverb [as submodifier] three times as much:to Katherine, the house was trebly impressivetrebly in other Oxford dictionaries Definition of trebly in the US English dictionary