English Reference
adjective

conscious

adj.
US /ˈkɑnʃəs/ UK /kˈɒnʃəs/ con·scious

  1. 01 B2 Upper Intermediate Medicine

    awake and able to see, hear, and think.

    physiologically awake and responsive to stimuli; possessing active mental faculties.

    Simple

    The patient was fully conscious and able to answer the doctor's questions.

    In context

    Although the victim had suffered a significant blow to the head, he remained conscious until the paramedics arrived at the scene.

  2. 02 B2 Upper Intermediate

    noticing or being aware of a particular fact or feeling.

    having knowledge or awareness of an external object, state, or fact; often followed by 'of'.

    Simple

    She was conscious of someone following her down the street.

    In context

    The speaker was acutely conscious of the growing tension in the room as he addressed the controversial budget cuts.

  3. 03 B2 Upper Intermediate

    done on purpose after thinking about it.

    resulting from a deliberate mental choice or intention rather than instinct or habit.

    Simple

    He made a conscious effort to be more polite to his colleagues.

    In context

    The designer made a conscious decision to use only recycled materials, even though it increased the total production cost.

  4. 04 B2 Upper Intermediate

    caring a lot about a specific issue, like the environment or health.

    strongly interested in or concerned about a particular subject; frequently used in compounds like 'fashion-conscious'.

    Simple

    Many young people are very environmentally conscious these days.

    In context

    The brand targets health-conscious consumers who are willing to pay a premium for organic, sugar-free alternatives.

Don't confuse

conscious vs conscience — Conscious is the state of being awake or aware; conscience is the internal moral compass that judges right from wrong.

Jacques was also conscious his own experience could only take him so far.

BBC News· 15 Aug 2026

We have super strengths and we have other areas we need to be very conscious [of] because we don’t have the elements or the structure that other clubs have.

The Guardian· 14 Aug 2026

First use appears c. 1573 in the sense of "aware of wrongdoing".https://web.archive.org/web/20220714064352/https://www.lexico.com/definition/conscious From Latin cōnscius (“conscious, conscious of guilt”), itself from con- (a form of com- (“together”)) + scīre (“to know”) + -us.

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

This entry
Origin Latin cōnscius
Level B2 · Upper Intermediate
Frequency Common
Updated