WordNet sense 1 (a trite or obvious remark):

banality, bromide, cliche, platitude

WordNet sense 2 (repeated too often; overfamiliar through overuse):

banal, hackneyed, shopworn, stock, threadbare, timeworn, tired, trite, well-worn, old-hat

WordNet sense 3 (not original; not being or productive of something fresh and unusual):

unoriginal

WordNet sense 4 (not exceptional in any way especially in quality or ability or size or degree):

ordinary

WordNet sense 5 (not challenging; dull and lacking excitement):

humdrum, prosaic, unglamorous, unglamourous

WordNet sense 6 (not exciting):

unexciting