It's an illness," she said, although she made the words sound like "it's uh nillness." Nillness, thought Strike, for a second distracted. Sometimes illness turned slowly to nillness, as was happening to Bristow's mother... sometimes nillness rose to meet you out of nowhere, like a concrete road slamming your skull apart.
Robert Galbraith, The Cuckoo's Calling
depression, illness, nillness