The definition of the word, "stubborn", in dictionary.com goes
"unreasonably obstinate; obstinately unmoving"
and in Longman Dictionary
" difficult to remove, deal with, or use "
Many of the examples these dictionaries provided are for describing a person that is hard to deal with. I wonder, can I say something is stubborn? If so, can I have some examples? If not, is there an adjective for saying something is hard to accomplish or uneasy to get rid of?