Is there a word or phrase to describe a person, or at least the quality of a person, who tends to leave out important details when communicating? For example someone said "The store Costco is dangerous". Initially I thought he meant their have been a lot of violent crimes around Costco, but latter I found out he was trying to say Costco is so cheap you end up spending a lot of money on things you don't really need.
I would like to use the word in the sentence "Person x is very _____ " or "Person x is very _____ in his communication style".
I was thinking of the word "unclear" but often times a person is unclear for the exact opposite reason, because they add too much information.