a person who people find uninteresting and tiring

nuisance

an expression that is or has been used too much (and how has no meaning or usefulness)

overused, hackneyed phrase

(the seeds of) any of various green plants e.g. wheat, oats, rye

dull, overused saying

a remark or statement that is obviously true but is used too often and is not interesting, e.g. 'Life has its ups and downs'

dull, overused saying