re·ac·tive rē-'ak-tiv adj
1 a) of, relating to, or marked by reaction <\reactive symptoms> <a \reactive process>
b) capable of reacting chemically <highly \reactive materials>
2 a) readily responsive to a stimulus <the skin of the geriatric is less \reactive than that of younger persons (Louis Tuft)>
b) occurring as a result of stress or emotional upset esp. from factors outside the organism <\reactive depression>
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adj.
describing mental illnesses that are precipitated by events in the psychological environment.
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re·ac·tive (re-akґtiv) characterized by reaction; readily responsive to a stimulus.Medical dictionary. 2011.