I manage someone who's body language and verbal sighing/complaining feels cleverly engineered (similar to a grumpy teenager always on the fringe of maintaining social veneer, but makes it very clear they're disinterested and distant). We're not quite talking about Harry Enfield's 'Kevin' here, but maybe that gives you an idea of their general approach to communication. This passive-aggressive resistance, coupled with a low output/performance makes myself and other colleagues find it difficult to collaborate and enjoy the working environment. During a particularly prolonged period of frustration, another colleague lost patience and 'fought fire with fire' by isolating and mirroring the same behaviour. Indicating they were unhappy in this way did snap them out of it, but was only a temporary solution similar to just 'telling a child off'. Occasionally though, they will turn up, perform really well and contribute positively to the working atmosphere but this is the exception in contrast. When I sit down and talk to them to try and understand, they close up and insist that nothing is wrong. You can see the threat response kick in, they 'shrink' and appear vulnerable. I have to carefully coax them back out, effectively tiptoeing around the situation due to their defensive emotional barriers. Between you and me, my gut tells me they're experiencing some complicated feelings about working here, but the pain of leaving and/or fear of finding another job is making it easier to continue 'sitting on the nail'. Have you ever experienced a similar situation or found yourself having to address/discuss such issues and if so, what approach did you take in trying to resolve and improve the behaviour?