Difficult personalities Book

Non-fiction academic like book, almost a bit of a quick dictionary in lay-man's terms about mental disorders. There is a little bit of "difficulty" in all of us but there is a boundary when actions become patterns and distructive to relationships. Being someone curious about psychology & relational elements of life I happened across this book when browsing the section in the library for a different book. There is such a stigma to "mental illness" that I've discussed with a few friends who deal with anxiety, depression, etc. so I grabbed it & wasn't sure if I'd read it. I ended up reading it quickly - some parts easier to skim than others. I found it refreshing to have a book point out the positives of what is deemed a "problem" more often, but also have some realistic ideas for how to converse & relate to someone too. Light reading? no. A book for everyone to read? nope. But if you're curious about the spectrum from quirks to disorders in the vast world of personalities then maybe a good pick for doing a little skimming over parts you are interested in at the library.