Mistrustful
When a person is exhibiting an act of not trusting people or situation around them are being mistrustful. In the journey of life, we are have encountered situation where we have found trusting a person or a situation might not prove to be beneficial on our part. In such situations, we have also resorted to mistrust. Therefore, here we can view mistrust as an evolutionarily adaptive behaviour which have helped animals to prepare for situation which might not go in their favour or be threatening.
However, when mistrust grows out of proportion certain psychological problem might arise. Firstly, a person can grow anxious not being able to trust the scenario or the person around them, always living with the doubt of catastrophe. Secondly, people suffering from paranoid schizophrenia or paranoid personality disorders is pathologically mistrustful towards their associates, especially towards their spouse, which causes havoc distress in their lives.