Definition of MODAL. 1. : of or relating to modality in logic. 2. : containing provisions as to the mode of procedure or the manner of taking effect âused of a contract or legacy. 3. : of or relating to a musical mode. 4. : of or relating to structure as opposed to substance. 5.
Pessimism is a temperamental trait, whereas depression is a clinical disease. In some instances, both pessimism and depression might be present, and it might be possible that a consistently negative attitude could lead to depression.
pessimistic time estimate. Definition. The maximum time required for an activity under adverse conditions. It is generally held that an activity would have no more than one chance in a hundred of exceeding this amount of time.