How do you Describe a person negative demeanor?

A person with a negative demeanor often exhibits a pessimistic attitude, frequently voicing complaints or criticisms. Their body language may be closed off, such as crossed arms or lack of eye contact, which can create an unapproachable aura. They might also display a lack of enthusiasm or engagement, contributing to a draining atmosphere for those around them. Overall, their demeanor can foster discomfort and discourage positive interactions.