Answer:
paranoid
Explanation:
Paranoid is defined is the condition where an unrealistic distrust or misunderstanding of others or it is a feeling of being persecuted by others. It is an extreme case of personality disorder where a person feels unsafe with others and always have a suspicion feeling and a mistrust feeling for others.
Thus in the context, Monil generally does not believe others and always feel that others are making a conspiracy against him. He always have a suspicion or a mistrust of other people. Thus he is suffering from extreme mental illness called paranoid personality disorder.