Step 1: Cluster A personality disorders (the odd or eccentric cluster) include paranoid, schizoid and schizotypal types. Among these the one defined by chronic distrust is paranoid personality disorder.
Step 2: Such a person constantly suspects deception and harm, questions the loyalty of friends, may wrongly doubt a spouse, and finds threatening intent in harmless comments. This guardedness pervades all relationships.
Step 3: Contrast this with the look-alikes. A schizoid individual is emotionally cold and prefers solitude but is not suspicious. A schizotypal individual displays eccentric ideas and magical thinking. The anankastic (obsessive-compulsive) type fixates on rules, lists and perfection. Only the paranoid type is built around suspicion.
Step 4: Matching the single feature of suspiciousness to its disorder gives the answer.
\[\boxed{\text{Paranoid personality disorder}}\]