2. Noun. A habitually suspicious person ¹
¹ Source: wiktionary.com
Medical Definition of Querulent
1. Denoting one who is ever suspicious, always opposing any suggestion, complaining of ill treatment and of being slighted or misunderstood, easily enraged, and dissatisfied; characteristic of paranoid personalities. Origin: L. Querulus, complaining, fr. Queror, to complain (05 Mar 2000)