Sentient

Adjective

 * 1) Conscious or aware.
 * 2) Experiencing sensation or feeling.
 * 3) (Primarily in Science Fiction) Possessing human-like intelligence.

Antonyms

 * insensate

Noun

 * 1) Lifeform with the capability to feel sensation, such as pain.

Thesaurus
alive, alive to, au courant, awake, aware, cognizant, conscious, conversant, emotionable, feeling, impressible, impressionable, impressive, knowing, open, perceptive, reactive, receptive, responsive, sensible, sensile, sensitive, sensitive to, susceptible, susceptive, witting

Etymology
From sentiens:, present active participle of sentio:.