  This paper introduces the Grievance Dictionary, a psycholinguistic dictionary
which can be used to automatically understand language use in the context of
grievance-fuelled violence threat assessment. We describe the development the
dictionary, which was informed by suggestions from experienced threat
assessment practitioners. These suggestions and subsequent human and
computational word list generation resulted in a dictionary of 20,502 words
annotated by 2,318 participants. The dictionary was validated by applying it to
texts written by violent and non-violent individuals, showing strong evidence
for a difference between populations in several dictionary categories. Further
classification tasks showed promising performance, but future improvements are
still needed. Finally, we provide instructions and suggestions for the use of
the Grievance Dictionary by security professionals and (violence) researchers.
