Bad
preposterous - Contrary to reason or common sense; utterly absurd or ridiculous.
When Sandy's stock broker called and suggested that he sell half his stocks because he felt the market was overvalued, Sandy thought the idea was preposterous - but it turned out that his stock broker was right.
senile - Used to describe behavior, mental states, or conditions associated with aging, especially when a person becomes forgetful or confused.
The elderly man showed symptoms of becoming senile, like forgetting where he put his keys, but with support, he managed to live independently for a while.
hackneyed - (of a phrase or idea) lacking significance through having been overused; unoriginal and trite
Ricky was ready to tell his boss he was completely prepared for the job, but he wanted to avoid being told a hackneyed expression like "make sure you have his ducks in a row."