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