What does conscious mean?
"Conscious" is an adjective describing a state of awareness — being awake, alert, and able to perceive oneself and one's surroundings. In its most common sense it applies to people and animals who have woken from sleep, anaesthesia, or unconsciousness; doctors use it clinically to describe patients who respond to stimuli. The word also carries a second sense: an action that is conscious is deliberate and intentional rather than automatic or accidental, as in a "conscious decision" to change careers. A third, highly productive usage appears in compound adjectives such as "health-conscious", "environmentally conscious", and "self-conscious", which describe someone keenly attentive to a particular concern. Derived forms include the noun "consciousness" — central to philosophy and neuroscience as the study of subjective experience — and the adverb "consciously". Its close relative "conscience", the inner moral sense, shares the same Latin root but refers specifically to ethical judgement, a distinction worth keeping clear. Precise and versatile, "conscious" remains essential vocabulary for describing mind, intention, and awareness.
Awake and aware of one's surroundings, oneself, and one's own perceptions.
"The patient remained conscious throughout the procedure."
This is the standard term in medical contexts, opposed to 'unconscious'.
Deliberate and intentional; done with full awareness.
"Her move abroad was a conscious decision, not an impulsive one."
Keenly aware of or concerned about something (usually in compounds such as self-conscious, health-conscious).
"As he grew older he became increasingly health-conscious."
The same Latin root that gives us 'conscious' also gives us 'science' — both trace back to 'scire', to know.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of conscious
"Conscious" derives from the Latin "conscius", meaning knowing with others or within oneself, formed from "com-" (together) plus "scire" (to know) — the same root that produced "science". It entered English in the late sixteenth or early seventeenth century, initially carrying senses relating to shared knowledge and inward knowledge before settling into its modern meanings of awareness and intentionality. Cognates include "conscience" and "conscientious", which share the root but developed along moral lines.
Related word forms
How conscious is actually used
In medical contexts, 'conscious' is the standard clinical term for a patient who is awake and responsive, contrasted with 'unconscious'. The prefixed forms 'self-conscious' and '-conscious' compounds are extremely productive in modern English.
Easily confused with conscious
Conscience is the noun meaning an inner moral sense of right and wrong, while conscious is an adjective describing awareness.
Conscientious describes someone diligent and careful in their duties, whereas conscious simply means aware or intentional.