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adjective
mundane - Ordinary and not interesting or exciting
tiresome - Making you feel annoyed or bored
humdrum - Activity, work or routine that is boring, monotonous or unexciting.
hackneyed - (of a phrase or idea) lacking significance through having been overused; unoriginal and trite
tedious - Too long, slow, or dull: tiresome or monotonous
noun
tedium - The state of being tedious
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Cliché - An overused phrase or expression that has lost its originality or impact.
drab - Lacking brightness or interest; drearily dull
bland - Lacking strong features or characteristics and therefore uninteresting
monotonous - Repetitious and boring