too sacred to be uttered "the ineffable name of the Deity"
exceptionally bad or displeasing "atrocious taste" "abominable workmanship" "an awful voice" "dreadful manners" "a painful performance" "terrible handwriting" "an unspeakable odor came sweeping into the room"
defying expression or description "indefinable yearnings" "indescribable beauty" "ineffable ecstasy" "inexpressible anguish" "unspeakable happiness" "unutterable contempt" "a thing of untellable splendor"