con·scious / ˈkänchəs/ • adj. aware of and responding to one's surroundings; awake. ∎ having knowledge of something; aware: we are conscious of the extent of the problem. ∎ (conscious of) painfully aware of; sensitive to: he was very conscious of his appearance. ∎ concerned with or worried about a particular matter: they were growing increasingly security-conscious. ∎ (of an action or feeling) deliberate and intentional. ∎ (of the mind or a thought) directly perceptible to and under the control of the person concerned.DERIVATIVES: con·scious·ly adv.