tediously, monotonally, repetitiously, grindingly, boringly, ploddingly, repetitively, unvariedly, mind-numbingly, wearisomely, more...

varied, diverse, interesting, exciting, stimulating

monotonous, monotone, monotonic, monotony, monotonal, monotonely, more...

said monotonly,   in a bored way,   said blankly,   said dully,   in a bored manner,   said boredly,   said robotically,   boredly said,   in a dull manner,   say apathetically