English Reference
adjective · noun

intensive

adj. · n.
US /ˌɪnˈtɛnsɪv/ UK /ɪntˈɛnsɪv/ in·ten·sive UK spelling intensives

  1. 01 B2 Upper Intermediate

    adj.involving a lot of work, effort, or detail in a short amount of time.

    adj.characterised by a high degree of concentration, thoroughness, or effort within a limited timeframe.

    Simple

    The students took an intensive one-week course to improve their coding skills.

    In context

    The diplomatic team engaged in intensive negotiations over the weekend to prevent the collapse of the trade agreement.

  2. 02 C1 Advanced Academic Economics

    adj.needing a large amount of a specific resource, like money or workers.

    adj.requiring a high input of a specific factor or resource relative to other factors; typically used in hyphenated compounds.

    Simple

    Fruit picking is a labor-intensive job because it must be done by hand.

    In context

    The transition to a green economy requires a shift away from carbon-intensive industries toward sustainable manufacturing processes.

    Usage

    Usually follows a noun with a hyphen, such as 'labor-intensive' or 'capital-intensive'.

  3. 03 B2 Upper Intermediate Medicine

    adj.related to the part of a hospital for people who are very seriously ill.

    adj.pertaining to the continuous and extremely close monitoring of patients with life-threatening conditions.

    Simple

    He was moved to the intensive care unit after his heart surgery.

    In context

    The patient remained in intensive care for three days while the medical team monitored her respiratory function.

  4. 04 C2 Proficiency Technical Linguistics

    n.a word or part of a word that makes another word stronger.

    n.a linguistic form, such as a prefix or suffix, that serves to increase the force or degree of the root word.

    Simple

    In some languages, repeating a word acts as an intensive to show more power.

    In context

    The scholar argued that the prefix in this specific dialect functions as an intensive rather than a simple directional marker.

    intensifier

Usage intensive care · intensive programme · intensive study

After being in intensive care for nearly two weeks, she died on Thursday.

BBC News· 14 Aug 2026

It has not invested in modern technology at the same rate as other countries, and suffers from a lack of theatre space, intensive care beds and staff.

BBC News· 13 Aug 2026

The adjective is derived from Late Middle English intensive (“fervent, great, intense”), borrowed from Old French intensif, intensive (modern French intensif) + Middle English -ive (suffix meaning ‘of the nature of, relating to’ forming adjectives), equivalent to intense + -ive. Intensif is from Medieval Latin intēnsīvus, from Latin intēnsus (“attentive; eager, intent; intensive”) + -īvus (suffix forming adjectives with the sense ‘doing; related to doing’); and intēnsus is the perfect passive participle of intendō (“to stretch out, strain”), from in- (prefix meaning ‘to, towards’) + tendō (“to extend, stretch, stretch out”) (ultimately from Proto-Indo-European *tend- (“to extend, stretch”)). Doublet of intend. The noun is derived from the adjective.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *tend-
Level C1 · Advanced
Frequency Common
Updated