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From The Collaborative International Dictionary of English v.0.48:
Upsetting \Up*set"ting\, a. 1. Conceited; assuming; as, an upsetting fellow. [Scot.] --Jamieson. [1913 Webster] 2. such as to disturb the self-possession of; unnerving; causing mental distress; as, the sight was an upsetting experience. [PJC]