Full Idea
Most traits are dispositions of a relatively stable sort, but traits need not be dispositions. A trait can be a lack of disposition.
Gist of Idea
Character traits are both possession of and lack of dispositions
Source
Peter Goldie (The Emotions [2000], 6 'Traits')
Book Reference
Goldie,Peter: 'The Emotions' [OUP 2002], p.153
A Reaction
Presumably only the lack relatively normal dispositions will count as traits.