Having an awareness of one's environment and one's own existence, sensations, and thoughts. See Synonyms at aware. Mentally perceptive or alert; awake: The patient remained fully conscious after the local anesthetic was administered. Capable of thought, will, or perception: the development of conscious life on the planet. Subjectively known or felt: conscious remorse. Intentionally conceived or done; deliberate: a conscious insult; made a conscious effort to speak more clearly. Inwardly attentive or sensible; mindful: was increasingly conscious of being watched. Especially aware of or preoccupied with. Often used in combination: a cost-conscious approach to further development; a health-conscious diet. In psychoanalysis, the component of waking awareness perceptible by a person at any given instant; consciousness.