(1):

(n.) Alt. of Stoical

(2):

(n.) A disciple of the philosopher Zeno; one of a Greek sect which held that men should be free from passion, unmoved by joy or grief, and should submit without complaint to unavoidable necessity, by which all things are governed.

(3):

(n.) Hence, a person not easily excited; an apathetic person; one who is apparently or professedly indifferent to pleasure or pain.