rē+ adjective
Etymology: probably from (assumed) New Latin reactivus, from New Latin reactus (past participle of reagere to react) + Latin -ivus -ive — more at react
1.
a. : of, relating to, or marked by reaction
reactive symptoms
a reactive process
b. : of, relating to, or marked by reactance
2.
a. : readily responsive to 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
reactive depression
• re·actively “+ adverb
• re·activeness “+ noun