His morbid suspiciousness, however, leads him to interpret various occurrences in his environment in a more or less delusional manner.
"Studies in Forensic Psychiatry"
Bernard Glueck
And the loss will add to the gloom of his grave and brooding nature, render his restless scheming and wandering still more capricious, and increase his suspiciousness and irritability.
"The Complete Historical Romances of Georg Ebers"
Georg Ebers
In point of suspiciousness their behavior is very different at different times, as, for that matter, is true of birds generally.
"Birds in the Bush"
Bradford Torrey