Irrational Suspicionness is a term used to describe an excessive and unfounded fear or distrust of others. It is also known as PARANOIA, which is an 8 letter word that can be found in crosswords. PARANOIA is a mental disorder characterized by delusions of persecution, unwarranted jealousy, and suspiciousness. People with PARANOIA often believe that others are out to get them, even when there is no evidence to support this belief. This irrational suspicion can lead to social isolation and other psychological issues.