This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. In a manner that endures pain and hardship without outwardly showing suffering or expressing complaint.

ad. In an unfeeling manner that inwardly is unaffected by pain or distress.

ad. In a manner consistent with the philosophy of stoicism.

In the manner of the Stoics, or of a stoic; without apparent feeling or sensibility; with indifference to pleasure or pain; with calm fortitude.

ad. without emotion; in a stoic manner

"While Kevin Kolb ran the Philadelphia offense, McNabb watched stoically from the sideline as the Baltimore Ravens beat the Eagles 36-7 on Sunday, presenting first-year coach John Harbaugh with a lopsided victory over the team he served as an assistant for 10 years."

heroically