Hyporeactive

Part of speech: adjective

Definitions

1. Exhibiting a reduced or diminished response to stimuli or external factors
2. Displaying less sensitivity or activity compared to normal reactions
3. Characterized by a lack of response or slower reactions in various contexts

Etymology: "Hyporeactive" is a plain compound: the prefix "hypo-", from Greek "hupo" meaning "under" or "beneath", attached to "reactive". The Greek prefix works in medicine and chemistry to mean "less than normal" or "below the usual level," as in "hypotension," where blood pressure falls below the usual range. Attaching it to "reactive" produces a word meaning that something responds less, or more slowly, than expected. "Reactive" itself traces back through Middle English and Old French to Latin "actus," the past participle of "agere" ("to drive, do, act"), combined with the prefix "re-" ("back, again"). "React" therefore literally means something like "act back in response." English gained "reactive" by adding the suffix "-ive," which came through Old French "-if" from Latin "-ivus," meaning "tending to" or "having the nature of."

Synonyms: underactive

Antonyms: hyperactive, overactive